diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
index c76994b26..7be851f4c 100644
--- a/.github/workflows/ci-tests.yml
+++ b/.github/workflows/ci-tests.yml
@@ -23,7 +23,7 @@ concurrency:
 
 jobs:
   tests:
-    name: "${{ matrix.session }} (py${{ matrix.python-version }} ${{ matrix.os }}) [${{ matrix.iris-source }}]"
+    name: "${{ matrix.session }} py${{ matrix.python-version }} [${{ matrix.iris-source }}]"
 
     runs-on: ${{ matrix.os }}
 
@@ -123,14 +123,16 @@ jobs:
           env_name: ${{ env.ENV_NAME }}
           lock_file: ${{ env.LOCK_FILE }}
 
-      - name: "iris ${{ matrix.session }}"
+      - name: "iris-grib ${{ matrix.session }}"
         env:
           IRIS_SOURCE: ${{ matrix.iris-source }}
           PY_COLORS: 1
           PY_VER: ${{ matrix.python-version }}
         run: |
-          nox --session ${{ matrix.session }} -- --test-data-dir ${HOME}/iris-test-data/test_data
+          nox --session ${{ matrix.session }} -- ${{ matrix.coverage }} --test-data-dir ${HOME}/iris-test-data/test_data
 
-      - name: "Upload coverage report"
+      - name: "upload coverage report"
+        if: ${{ matrix.coverage }}
         uses: codecov/codecov-action@v4
-        if: ${{ matrix.coverage }}
\ No newline at end of file
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
diff --git a/README.md b/README.md
index 32fb3a205..78fffb13a 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@
 | ⚙️ CI            | [![ci-manifest](https://github.com/SciTools/iris-grib/actions/workflows/ci-manifest.yml/badge.svg)](https://github.com/SciTools/iris-grib/actions/workflows/ci-manifest.yml) [![ci-tests](https://github.com/SciTools/iris-grib/actions/workflows/ci-tests.yml/badge.svg)](https://github.com/SciTools/iris-grib/actions/workflows/ci-tests.yml) [![pre-commit](https://results.pre-commit.ci/badge/github/SciTools/iris-grib/main.svg)](https://results.pre-commit.ci/latest/github/SciTools/iris-grib/main)                                                        |
 | 💬 Community     | [![GH Discussions](https://img.shields.io/badge/github-discussions%20%F0%9F%92%AC-yellow?logo=github&logoColor=lightgrey)](https://github.com/SciTools/iris-grib/discussions)                                                                                                                                                                                                                                                                                                                                                                                        |
 | 📖 Documentation | [![rtd](https://readthedocs.org/projects/iris-grib/badge/?version=latest)](https://iris-grib.readthedocs.io/en/latest/?badge=latest)                                                                                                                                                                                                                                                                                                                                                                                                                                 |
-| 📈 Health        | [![coveralls](https://coveralls.io/repos/github/SciTools/iris-grib/badge.svg?branch=main)](https://coveralls.io/github/SciTools/iris-grib?branch=main)                                                                                                                                                                                                                                                                                                                                                                                                               |
+| 📈 Health        | [![codecov](https://codecov.io/gh/SciTools/iris-grib/graph/badge.svg?token=5VtBaElXFW)](https://codecov.io/gh/SciTools/iris-grib)                                                                                                                                                                                                                                                                                                                                                                                                                                    |
 | ✨ Meta           | [![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff) [![NEP29](https://raster.shields.io/badge/follows-NEP29-orange.png)](https://numpy.org/neps/nep-0029-deprecation_policy.html) [![license - bds-3-clause](https://img.shields.io/github/license/SciTools/iris-grib)](https://github.com/SciTools/iris-grib/blob/main/LICENSE) [![conda platform](https://img.shields.io/conda/pn/conda-forge/iris-grib.svg)](https://anaconda.org/conda-forge/iris-grib) |
 | 📦 Package       | [![conda-forge](https://img.shields.io/conda/vn/conda-forge/iris-grib?color=orange&label=conda-forge&logo=conda-forge&logoColor=white)](https://anaconda.org/conda-forge/iris-grib) [![pypi](https://img.shields.io/pypi/v/iris-grib?color=orange&label=pypi&logo=python&logoColor=white)](https://pypi.org/project/iris-grib/) [![pypi - python version](https://img.shields.io/pypi/pyversions/iris-grib.svg?color=orange&logo=python&label=python&logoColor=white)](https://pypi.org/project/iris-grib/)                                                          |
 | 🧰 Repo          | [![commits-since](https://img.shields.io/github/commits-since/SciTools/iris-grib/latest.svg)](https://github.com/SciTools/iris-grib/commits/main) [![contributors](https://img.shields.io/github/contributors/SciTools/iris-grib)](https://github.com/SciTools/iris-grib/graphs/contributors) [![release](https://img.shields.io/github/v/release/scitools/iris-grib)](https://github.com/SciTools/iris-grib/releases)                                                                                                                                               |
diff --git a/noxfile.py b/noxfile.py
index 7d68435f7..1b77a7d5c 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -270,11 +270,15 @@ def tests(session: nox.sessions.Session, iris_source: str):
 
     session.run("python", "-m", "eccodes", "selfcheck")
 
-    session.run(
+    run_args = [
         "pytest",
         "--pyargs",
         "iris_grib",
-    )
+    ]
+
+    if "-c" in session.posargs or "--coverage" in session.posargs:
+        run_args.extend(["--cov=iris_grib", "--cov-report=xml"])
+    session.run(*run_args)
 
 
 @nox.session(python=PY_VER, venv_backend="conda")
diff --git a/pyproject.toml b/pyproject.toml
index f3e276497..6fdd75927 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,12 +31,13 @@ classifiers = [
     "Topic :: Scientific/Engineering :: Atmospheric Science",
     "Topic :: Scientific/Engineering :: Visualization",
 ]
+description = "Functionality for converting between weather/climate datasets stored as GRIB files and SciTools-Iris Cubes"
 dynamic = [
     "dependencies",
+    "optional-dependencies",
     "readme",
     "version",
 ]
-description = "Functionality for converting between weather/climate datasets stored as GRIB files and SciTools-Iris Cubes"
 keywords = [
     "iris",
     "GRIB",
@@ -58,10 +59,12 @@ Issues = "https://github.com/SciTools/iris-grib/issues"
 license-files = ["LICENSE"]
 
 [tool.setuptools.dynamic]
-dependencies = {file = "requirements/core.txt"}
+dependencies = {file = "requirements/pypi-core.txt"}
 readme = {file = "README.md", content-type = "text/markdown"}
-optional-dependencies.all = {file = "requirements/all.txt"}
-optional-dependencies.test = {file = "requirements/test.txt"}
+
+[tool.setuptools.dynamic.optional-dependencies]
+dev = {file = "requirements/pypi-optional-dev.txt"}
+test = {file = "requirements/pypi-optional-test.txt"}
 
 [tool.setuptools.packages.find]
 include = ["iris_grib*"]
diff --git a/requirements/all.txt b/requirements/all.txt
deleted file mode 100644
index e776a67c8..000000000
--- a/requirements/all.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-# Optional dependencies.
-
-mo_pack
diff --git a/requirements/core.txt b/requirements/core.txt
deleted file mode 100644
index 142dd7574..000000000
--- a/requirements/core.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-# Core dependencies.
-
-scitools-iris>=3.0.2
-eccodes>=1.6.1
\ No newline at end of file
diff --git a/requirements/locks/py310-linux-64.lock b/requirements/locks/py310-linux-64.lock
index bb4587ab4..5a17684f9 100644
--- a/requirements/locks/py310-linux-64.lock
+++ b/requirements/locks/py310-linux-64.lock
@@ -1,6 +1,6 @@
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: bb88ce5d10a10e0a0df2ba8800b44ef1b44c069439153d3d6e424343ba556057
+# input_hash: 4c1c053d02dd4f1e5cf7ab187666840f573cfba8ed9387d768c66010531db165
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
 https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2024.2.2-hbcca054_0.conda#2f4327a1cbe7f022401b236e915a5fef
@@ -76,15 +76,21 @@ https://conda.anaconda.org/conda-forge/linux-64/udunits2-2.2.28-h40f5838_3.conda
 https://conda.anaconda.org/conda-forge/linux-64/xorg-libx11-1.8.9-h8ee46fc_0.conda#077b6e8ad6a3ddb741fce2496dd01bec
 https://conda.anaconda.org/conda-forge/noarch/alabaster-0.7.16-pyhd8ed1ab_0.conda#def531a3ac77b7fb8c21d17bb5d0badb
 https://conda.anaconda.org/conda-forge/noarch/antlr-python-runtime-4.11.1-pyhd8ed1ab_0.tar.bz2#15109c4977d39ad7aa3423f57243e286
+https://conda.anaconda.org/conda-forge/noarch/argcomplete-3.3.0-pyhd8ed1ab_0.conda#f42f433e48d6a715c0978b44a9219406
 https://conda.anaconda.org/conda-forge/noarch/attrs-23.2.0-pyh71513ae_0.conda#5e4c0743c70186509d1412e03c2d8dfa
 https://conda.anaconda.org/conda-forge/linux-64/brotli-1.1.0-hd590300_1.conda#f27a24d46e3ea7b70a1f98e50c62508f
 https://conda.anaconda.org/conda-forge/linux-64/brotli-python-1.1.0-py310hc6cd4ac_1.conda#1f95722c94f00b69af69a066c7433714
+https://conda.anaconda.org/conda-forge/noarch/cachetools-5.3.3-pyhd8ed1ab_0.conda#cd4c26c702a9bcdc70ff05b609ddacbe
 https://conda.anaconda.org/conda-forge/noarch/certifi-2024.2.2-pyhd8ed1ab_0.conda#0876280e409658fc6f9e75d035960333
+https://conda.anaconda.org/conda-forge/noarch/cfgv-3.3.1-pyhd8ed1ab_0.tar.bz2#ebb5f5f7dc4f1a3780ef7ea7738db08c
+https://conda.anaconda.org/conda-forge/linux-64/chardet-5.2.0-py310hff52083_1.conda#a677136a83b823803d2f92045f885be2
 https://conda.anaconda.org/conda-forge/noarch/charset-normalizer-3.3.2-pyhd8ed1ab_0.conda#7f4a9e3fcff3f6356ae99244a014da6a
 https://conda.anaconda.org/conda-forge/noarch/click-8.1.7-unix_pyh707e725_0.conda#f3ad426304898027fc619827ff428eca
 https://conda.anaconda.org/conda-forge/noarch/cloudpickle-3.0.0-pyhd8ed1ab_0.conda#753d29fe41bb881e4b9c004f0abf973f
 https://conda.anaconda.org/conda-forge/noarch/colorama-0.4.6-pyhd8ed1ab_0.tar.bz2#3faab06a954c2a04039983f2c4a50d99
+https://conda.anaconda.org/conda-forge/linux-64/colorlog-6.8.2-py310hff52083_0.conda#db1be62a6a5d51f5a36fb99b2cc12972
 https://conda.anaconda.org/conda-forge/noarch/cycler-0.12.1-pyhd8ed1ab_0.conda#5cd86562580f274031ede6aa6aa24441
+https://conda.anaconda.org/conda-forge/noarch/distlib-0.3.8-pyhd8ed1ab_0.conda#db16c66b759a64dc5183d69cc3745a52
 https://conda.anaconda.org/conda-forge/linux-64/docutils-0.20.1-py310hff52083_3.conda#c159dcd29bbd80b187b1c5d5f73cc971
 https://conda.anaconda.org/conda-forge/noarch/exceptiongroup-1.2.0-pyhd8ed1ab_2.conda#8d652ea2ee8eaee02ed8dc820bc794aa
 https://conda.anaconda.org/conda-forge/noarch/filelock-3.13.4-pyhd8ed1ab_0.conda#6baa2e7fc09bd2c7c82cb6662d5f1d36
@@ -103,6 +109,7 @@ https://conda.anaconda.org/conda-forge/linux-64/markupsafe-2.1.5-py310h2372a71_0
 https://conda.anaconda.org/conda-forge/noarch/munkres-1.1.4-pyh9f0ad1d_0.tar.bz2#2ba8498c1018c1e9c61eb99b973dfe19
 https://conda.anaconda.org/conda-forge/linux-64/openjpeg-2.5.2-h488ebb8_0.conda#7f2e286780f072ed750df46dc2631138
 https://conda.anaconda.org/conda-forge/noarch/packaging-24.0-pyhd8ed1ab_0.conda#248f521b64ce055e7feae3105e7abeb8
+https://conda.anaconda.org/conda-forge/noarch/platformdirs-4.2.1-pyhd8ed1ab_0.conda#d478a8a3044cdff1aa6e62f9269cefe0
 https://conda.anaconda.org/conda-forge/noarch/pluggy-1.5.0-pyhd8ed1ab_0.conda#d3483c8fc2dc2cc3f5cf43e26d60cabf
 https://conda.anaconda.org/conda-forge/noarch/pycparser-2.22-pyhd8ed1ab_0.conda#844d9eb3b43095b031874477f7d70088
 https://conda.anaconda.org/conda-forge/noarch/pygments-2.17.2-pyhd8ed1ab_0.conda#140a7f159396547e9799aa98f9f0742e
@@ -116,6 +123,7 @@ https://conda.anaconda.org/conda-forge/noarch/setuptools-69.5.1-pyhd8ed1ab_0.con
 https://conda.anaconda.org/conda-forge/noarch/six-1.16.0-pyh6c4a22f_0.tar.bz2#e5f25f8dbc060e9a8d912e432202afc2
 https://conda.anaconda.org/conda-forge/noarch/snowballstemmer-2.2.0-pyhd8ed1ab_0.tar.bz2#4d22a9315e78c6827f806065957d566e
 https://conda.anaconda.org/conda-forge/noarch/sphinxcontrib-jsmath-1.0.1-pyhd8ed1ab_0.conda#da1d979339e2714c30a8e806a33ec087
+https://conda.anaconda.org/conda-forge/noarch/toml-0.10.2-pyhd8ed1ab_0.tar.bz2#f832c45a477c78bebd107098db465095
 https://conda.anaconda.org/conda-forge/noarch/tomli-2.0.1-pyhd8ed1ab_0.tar.bz2#5844808ffab9ebdb694585b50ba02a96
 https://conda.anaconda.org/conda-forge/noarch/toolz-0.12.1-pyhd8ed1ab_0.conda#2fcb582444635e2c402e8569bb94e039
 https://conda.anaconda.org/conda-forge/noarch/typing_extensions-4.11.0-pyha770c72_0.conda#6ef2fc37559256cf682d8b3375e89b80
@@ -126,6 +134,7 @@ https://conda.anaconda.org/conda-forge/linux-64/xorg-libxfixes-5.0.3-h7f98852_10
 https://conda.anaconda.org/conda-forge/noarch/zipp-3.17.0-pyhd8ed1ab_0.conda#2e4d6bc0b14e10f895fc6791a7d9b26a
 https://conda.anaconda.org/conda-forge/noarch/babel-2.14.0-pyhd8ed1ab_0.conda#9669586875baeced8fc30c0826c3270e
 https://conda.anaconda.org/conda-forge/linux-64/cffi-1.16.0-py310h2fee648_0.conda#45846a970e71ac98fd327da5d40a0a2c
+https://conda.anaconda.org/conda-forge/linux-64/coverage-7.5.0-py310hc51659f_0.conda#3609fdb03842f67e2ec68a9c137221b8
 https://conda.anaconda.org/conda-forge/linux-64/fonttools-4.51.0-py310h2372a71_0.conda#1a4773624145c15b92820fe6c87c5fcd
 https://conda.anaconda.org/conda-forge/linux-64/hdf5-1.14.3-nompi_h4f84152_100.conda#d471a5c3abc984b662d9bae3bb7fd8a5
 https://conda.anaconda.org/conda-forge/noarch/importlib-metadata-7.1.0-pyha770c72_0.conda#0896606848b2dc5cebdf111b6543aa04
@@ -133,35 +142,45 @@ https://conda.anaconda.org/conda-forge/noarch/jinja2-3.1.3-pyhd8ed1ab_0.conda#e7
 https://conda.anaconda.org/conda-forge/linux-64/libcblas-3.9.0-22_linux64_openblas.conda#4b31699e0ec5de64d5896e580389c9a1
 https://conda.anaconda.org/conda-forge/linux-64/libglu-9.0.0-hac7e632_1003.conda#50c389a09b6b7babaef531eb7cb5e0ca
 https://conda.anaconda.org/conda-forge/linux-64/liblapack-3.9.0-22_linux64_openblas.conda#b083767b6c877e24ee597d93b87ab838
+https://conda.anaconda.org/conda-forge/noarch/nodeenv-1.8.0-pyhd8ed1ab_0.conda#2a75b296096adabbabadd5e9782e5fcc
 https://conda.anaconda.org/conda-forge/noarch/partd-1.4.1-pyhd8ed1ab_0.conda#acf4b7c0bcd5fa3b0e05801c4d2accd6
 https://conda.anaconda.org/conda-forge/linux-64/pillow-10.3.0-py310hf73ecf8_0.conda#1de56cf017dfd02aa84093206a0141a8
 https://conda.anaconda.org/conda-forge/noarch/pip-24.0-pyhd8ed1ab_0.conda#f586ac1e56c8638b64f9c8122a7b8a67
 https://conda.anaconda.org/conda-forge/linux-64/proj-9.3.1-h1d62c97_0.conda#44ec51d0857d9be26158bb85caa74fdb
+https://conda.anaconda.org/conda-forge/noarch/pyproject-api-1.6.1-pyhd8ed1ab_0.conda#1815c7974568079cf384f012de5ea1b7
 https://conda.anaconda.org/conda-forge/noarch/pytest-8.1.1-pyhd8ed1ab_0.conda#94ff09cdedcb7b17e9cd5097ee2cfcff
 https://conda.anaconda.org/conda-forge/noarch/python-dateutil-2.9.0-pyhd8ed1ab_0.conda#2cf4264fffb9e6eff6031c5b6884d61c
 https://conda.anaconda.org/conda-forge/noarch/typing-extensions-4.11.0-hd8ed1ab_0.conda#471e3988f8ca5e9eb3ce6be7eac3bcee
 https://conda.anaconda.org/conda-forge/noarch/urllib3-2.2.1-pyhd8ed1ab_0.conda#08807a87fa7af10754d46f63b368e016
+https://conda.anaconda.org/conda-forge/noarch/virtualenv-20.26.0-pyhd8ed1ab_0.conda#7d2bc38bd1777c86cc345e510735d9ff
 https://conda.anaconda.org/conda-forge/linux-64/xorg-libxi-1.7.10-h7f98852_0.tar.bz2#e77615e5141cad5a2acaa043d1cf0ca5
 https://conda.anaconda.org/conda-forge/linux-64/freeglut-3.2.2-hac7e632_2.conda#6e553df297f6e64668efb54302e0f139
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 https://conda.anaconda.org/conda-forge/linux-64/libnetcdf-4.9.2-nompi_h9612171_113.conda#b2414908e43c442ddc68e6148774a304
 https://conda.anaconda.org/conda-forge/linux-64/numpy-1.26.4-py310hb13e2d6_0.conda#6593de64c935768b6bad3e19b3e978be
 https://conda.anaconda.org/conda-forge/linux-64/pyproj-3.6.1-py310hd5c30f3_5.conda#dc2ee770a2299307f3c127af79160d25
+https://conda.anaconda.org/conda-forge/noarch/pytest-cov-5.0.0-pyhd8ed1ab_0.conda#c54c0107057d67ddf077751339ec2c63
 https://conda.anaconda.org/conda-forge/noarch/pytest-mock-3.14.0-pyhd8ed1ab_0.conda#4b9b5e086812283c052a9105ab1e254e
 https://conda.anaconda.org/conda-forge/noarch/requests-2.31.0-pyhd8ed1ab_0.conda#a30144e4156cdbb236f99ebb49828f8b
 https://conda.anaconda.org/conda-forge/noarch/setuptools-scm-8.0.4-pyhd8ed1ab_1.conda#a1986ad21c766ff22f7bae93f0641020
+https://conda.anaconda.org/conda-forge/linux-64/ukkonen-1.0.1-py310hd41b1e2_4.conda#35e87277fba9944b8a975113538bb5df
 https://conda.anaconda.org/conda-forge/linux-64/cftime-1.6.3-py310h1f7b6fc_0.conda#31beda75384647959d5792a1a7dc571a
+https://conda.anaconda.org/conda-forge/noarch/codecov-2.1.13-pyhd8ed1ab_0.conda#2cc61ba1dd53f0806247333f1294e058
 https://conda.anaconda.org/conda-forge/linux-64/contourpy-1.2.1-py310hd41b1e2_0.conda#60ee50b1968f802f2a487ba36d4cce0d
 https://conda.anaconda.org/conda-forge/noarch/dask-core-2024.4.2-pyhd8ed1ab_0.conda#bb4e6c52855aa64a5443ca4eedaa6cfe
+https://conda.anaconda.org/conda-forge/noarch/identify-2.5.36-pyhd8ed1ab_0.conda#ba68cb5105760379432cebc82b45af40
 https://conda.anaconda.org/conda-forge/linux-64/jasper-4.2.3-he6dfbbe_0.conda#05c1609de571f7a9a40e6d7d4116c21a
 https://conda.anaconda.org/conda-forge/linux-64/mo_pack-0.3.0-py310h2372a71_1.conda#dfcf64f67961eb9686676f96fdb4b4d1
 https://conda.anaconda.org/conda-forge/linux-64/scipy-1.13.0-py310hb13e2d6_0.conda#512cfc0369e247e3993a76030671cce0
 https://conda.anaconda.org/conda-forge/noarch/setuptools_scm-8.0.4-hd8ed1ab_1.conda#b065535ca8ca824703ae5537087e2206
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+https://conda.anaconda.org/conda-forge/noarch/tox-4.14.2-pyhd8ed1ab_0.conda#0c3413e30566dbc162c71ef7190259c4
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diff --git a/requirements/locks/py311-linux-64.lock b/requirements/locks/py311-linux-64.lock
index 11d8baef2..4624e8606 100644
--- a/requirements/locks/py311-linux-64.lock
+++ b/requirements/locks/py311-linux-64.lock
@@ -1,6 +1,6 @@
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: 1279dfdc9dd0c047ff7eaebc0d9b8b86d968c282cc67f8db940122c918a0dc4a
+# input_hash: 6a68a02a78ade04a4a59ce590941c300e88b24a33dba39a768238431f8839a35
 @EXPLICIT
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@@ -76,15 +76,21 @@ https://conda.anaconda.org/conda-forge/linux-64/udunits2-2.2.28-h40f5838_3.conda
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+https://conda.anaconda.org/conda-forge/noarch/distlib-0.3.8-pyhd8ed1ab_0.conda#db16c66b759a64dc5183d69cc3745a52
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@@ -103,6 +109,7 @@ https://conda.anaconda.org/conda-forge/linux-64/markupsafe-2.1.5-py311h459d7ec_0
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+https://conda.anaconda.org/conda-forge/noarch/platformdirs-4.2.1-pyhd8ed1ab_0.conda#d478a8a3044cdff1aa6e62f9269cefe0
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@@ -116,6 +123,7 @@ https://conda.anaconda.org/conda-forge/noarch/setuptools-69.5.1-pyhd8ed1ab_0.con
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+https://conda.anaconda.org/conda-forge/noarch/toml-0.10.2-pyhd8ed1ab_0.tar.bz2#f832c45a477c78bebd107098db465095
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@@ -125,6 +133,7 @@ https://conda.anaconda.org/conda-forge/linux-64/xorg-libxfixes-5.0.3-h7f98852_10
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+https://conda.anaconda.org/conda-forge/linux-64/coverage-7.5.0-py311h331c9d8_0.conda#5420e3594638adf670fca1a601d7efb9
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@@ -132,35 +141,45 @@ https://conda.anaconda.org/conda-forge/noarch/jinja2-3.1.3-pyhd8ed1ab_0.conda#e7
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diff --git a/requirements/locks/py312-linux-64.lock b/requirements/locks/py312-linux-64.lock
index c02d488fd..932a4e631 100644
--- a/requirements/locks/py312-linux-64.lock
+++ b/requirements/locks/py312-linux-64.lock
@@ -1,6 +1,6 @@
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: 2303059b56cea7e0a0d3f3356752a792ae2582a7d26e089af84842308db60b23
+# input_hash: e331628709411f536645415b97f6e9a33cc09a114009b8a454673ee8d5392707
 @EXPLICIT
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@@ -76,15 +76,21 @@ https://conda.anaconda.org/conda-forge/linux-64/udunits2-2.2.28-h40f5838_3.conda
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+https://conda.anaconda.org/conda-forge/linux-64/colorlog-6.8.2-py312h7900ff3_0.conda#0c03a414b685c2406126b677a8f0e083
 https://conda.anaconda.org/conda-forge/noarch/cycler-0.12.1-pyhd8ed1ab_0.conda#5cd86562580f274031ede6aa6aa24441
+https://conda.anaconda.org/conda-forge/noarch/distlib-0.3.8-pyhd8ed1ab_0.conda#db16c66b759a64dc5183d69cc3745a52
 https://conda.anaconda.org/conda-forge/linux-64/docutils-0.20.1-py312h7900ff3_3.conda#1b90835ae26b9b8250b302649359a989
 https://conda.anaconda.org/conda-forge/noarch/exceptiongroup-1.2.0-pyhd8ed1ab_2.conda#8d652ea2ee8eaee02ed8dc820bc794aa
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@@ -103,6 +109,7 @@ https://conda.anaconda.org/conda-forge/linux-64/markupsafe-2.1.5-py312h98912ed_0
 https://conda.anaconda.org/conda-forge/noarch/munkres-1.1.4-pyh9f0ad1d_0.tar.bz2#2ba8498c1018c1e9c61eb99b973dfe19
 https://conda.anaconda.org/conda-forge/linux-64/openjpeg-2.5.2-h488ebb8_0.conda#7f2e286780f072ed750df46dc2631138
 https://conda.anaconda.org/conda-forge/noarch/packaging-24.0-pyhd8ed1ab_0.conda#248f521b64ce055e7feae3105e7abeb8
+https://conda.anaconda.org/conda-forge/noarch/platformdirs-4.2.1-pyhd8ed1ab_0.conda#d478a8a3044cdff1aa6e62f9269cefe0
 https://conda.anaconda.org/conda-forge/noarch/pluggy-1.5.0-pyhd8ed1ab_0.conda#d3483c8fc2dc2cc3f5cf43e26d60cabf
 https://conda.anaconda.org/conda-forge/noarch/pycparser-2.22-pyhd8ed1ab_0.conda#844d9eb3b43095b031874477f7d70088
 https://conda.anaconda.org/conda-forge/noarch/pygments-2.17.2-pyhd8ed1ab_0.conda#140a7f159396547e9799aa98f9f0742e
@@ -116,6 +123,7 @@ https://conda.anaconda.org/conda-forge/noarch/setuptools-69.5.1-pyhd8ed1ab_0.con
 https://conda.anaconda.org/conda-forge/noarch/six-1.16.0-pyh6c4a22f_0.tar.bz2#e5f25f8dbc060e9a8d912e432202afc2
 https://conda.anaconda.org/conda-forge/noarch/snowballstemmer-2.2.0-pyhd8ed1ab_0.tar.bz2#4d22a9315e78c6827f806065957d566e
 https://conda.anaconda.org/conda-forge/noarch/sphinxcontrib-jsmath-1.0.1-pyhd8ed1ab_0.conda#da1d979339e2714c30a8e806a33ec087
+https://conda.anaconda.org/conda-forge/noarch/toml-0.10.2-pyhd8ed1ab_0.tar.bz2#f832c45a477c78bebd107098db465095
 https://conda.anaconda.org/conda-forge/noarch/tomli-2.0.1-pyhd8ed1ab_0.tar.bz2#5844808ffab9ebdb694585b50ba02a96
 https://conda.anaconda.org/conda-forge/noarch/toolz-0.12.1-pyhd8ed1ab_0.conda#2fcb582444635e2c402e8569bb94e039
 https://conda.anaconda.org/conda-forge/noarch/typing_extensions-4.11.0-pyha770c72_0.conda#6ef2fc37559256cf682d8b3375e89b80
@@ -125,6 +133,7 @@ https://conda.anaconda.org/conda-forge/linux-64/xorg-libxfixes-5.0.3-h7f98852_10
 https://conda.anaconda.org/conda-forge/noarch/zipp-3.17.0-pyhd8ed1ab_0.conda#2e4d6bc0b14e10f895fc6791a7d9b26a
 https://conda.anaconda.org/conda-forge/noarch/babel-2.14.0-pyhd8ed1ab_0.conda#9669586875baeced8fc30c0826c3270e
 https://conda.anaconda.org/conda-forge/linux-64/cffi-1.16.0-py312hf06ca03_0.conda#56b0ca764ce23cc54f3f7e2a7b970f6d
+https://conda.anaconda.org/conda-forge/linux-64/coverage-7.5.0-py312h9a8786e_0.conda#25044745b530207291239ad6f914c1d8
 https://conda.anaconda.org/conda-forge/linux-64/fonttools-4.51.0-py312h98912ed_0.conda#f0cd0e54adf65aaa976f5731b7a3f383
 https://conda.anaconda.org/conda-forge/linux-64/hdf5-1.14.3-nompi_h4f84152_100.conda#d471a5c3abc984b662d9bae3bb7fd8a5
 https://conda.anaconda.org/conda-forge/noarch/importlib-metadata-7.1.0-pyha770c72_0.conda#0896606848b2dc5cebdf111b6543aa04
@@ -132,35 +141,45 @@ https://conda.anaconda.org/conda-forge/noarch/jinja2-3.1.3-pyhd8ed1ab_0.conda#e7
 https://conda.anaconda.org/conda-forge/linux-64/libcblas-3.9.0-22_linux64_openblas.conda#4b31699e0ec5de64d5896e580389c9a1
 https://conda.anaconda.org/conda-forge/linux-64/libglu-9.0.0-hac7e632_1003.conda#50c389a09b6b7babaef531eb7cb5e0ca
 https://conda.anaconda.org/conda-forge/linux-64/liblapack-3.9.0-22_linux64_openblas.conda#b083767b6c877e24ee597d93b87ab838
+https://conda.anaconda.org/conda-forge/noarch/nodeenv-1.8.0-pyhd8ed1ab_0.conda#2a75b296096adabbabadd5e9782e5fcc
 https://conda.anaconda.org/conda-forge/noarch/partd-1.4.1-pyhd8ed1ab_0.conda#acf4b7c0bcd5fa3b0e05801c4d2accd6
 https://conda.anaconda.org/conda-forge/linux-64/pillow-10.3.0-py312hdcec9eb_0.conda#425bb325f970e57a047ac57c4586489d
 https://conda.anaconda.org/conda-forge/noarch/pip-24.0-pyhd8ed1ab_0.conda#f586ac1e56c8638b64f9c8122a7b8a67
 https://conda.anaconda.org/conda-forge/linux-64/proj-9.3.1-h1d62c97_0.conda#44ec51d0857d9be26158bb85caa74fdb
+https://conda.anaconda.org/conda-forge/noarch/pyproject-api-1.6.1-pyhd8ed1ab_0.conda#1815c7974568079cf384f012de5ea1b7
 https://conda.anaconda.org/conda-forge/noarch/pytest-8.1.1-pyhd8ed1ab_0.conda#94ff09cdedcb7b17e9cd5097ee2cfcff
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 https://conda.anaconda.org/conda-forge/noarch/urllib3-2.2.1-pyhd8ed1ab_0.conda#08807a87fa7af10754d46f63b368e016
+https://conda.anaconda.org/conda-forge/noarch/virtualenv-20.26.0-pyhd8ed1ab_0.conda#7d2bc38bd1777c86cc345e510735d9ff
 https://conda.anaconda.org/conda-forge/linux-64/xorg-libxi-1.7.10-h7f98852_0.tar.bz2#e77615e5141cad5a2acaa043d1cf0ca5
 https://conda.anaconda.org/conda-forge/linux-64/freeglut-3.2.2-hac7e632_2.conda#6e553df297f6e64668efb54302e0f139
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+https://conda.anaconda.org/conda-forge/noarch/pytest-cov-5.0.0-pyhd8ed1ab_0.conda#c54c0107057d67ddf077751339ec2c63
 https://conda.anaconda.org/conda-forge/noarch/pytest-mock-3.14.0-pyhd8ed1ab_0.conda#4b9b5e086812283c052a9105ab1e254e
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+https://conda.anaconda.org/conda-forge/linux-64/ukkonen-1.0.1-py312h8572e83_4.conda#52c9e25ee0a32485a102eeecdb7eef52
 https://conda.anaconda.org/conda-forge/linux-64/cftime-1.6.3-py312hc7c0aa3_0.conda#bd11505f0fe9bd8bcec01ce1220f63c7
+https://conda.anaconda.org/conda-forge/noarch/codecov-2.1.13-pyhd8ed1ab_0.conda#2cc61ba1dd53f0806247333f1294e058
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+https://conda.anaconda.org/conda-forge/noarch/identify-2.5.36-pyhd8ed1ab_0.conda#ba68cb5105760379432cebc82b45af40
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+https://conda.anaconda.org/conda-forge/noarch/tox-4.14.2-pyhd8ed1ab_0.conda#0c3413e30566dbc162c71ef7190259c4
 https://conda.anaconda.org/conda-forge/linux-64/cf-units-3.2.0-py312hc7c0aa3_4.conda#d9c9fa64fdf4e57d7f8957b957d784a0
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 https://conda.anaconda.org/conda-forge/linux-64/netcdf4-1.6.5-nompi_py312h26027e0_100.conda#2d7b4954dc5a090796e0ba89c325d09b
+https://conda.anaconda.org/conda-forge/noarch/nox-2024.4.15-pyhff2d567_0.conda#600c0de12125f473d8099c0b3e6f88d4
+https://conda.anaconda.org/conda-forge/noarch/pre-commit-3.7.0-pyha770c72_0.conda#846ba0877cda9c4f11e13720cacd1968
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 https://conda.anaconda.org/conda-forge/noarch/iris-3.9.0-pyha770c72_0.conda#efaf150eb009f04efa58f1401c767192
diff --git a/requirements/py310.yml b/requirements/py310.yml
index 99073e852..cebb48837 100644
--- a/requirements/py310.yml
+++ b/requirements/py310.yml
@@ -18,12 +18,16 @@ dependencies:
 # Optional dependencies.
   - mo_pack
   - pip
+  - pre-commit
 
 # Test dependencies.
+  - codecov
   - filelock
+  - nox
   - requests
   - iris-sample-data
   - pytest
+  - pytest-cov
   - pytest-mock
 
 # Documentation dependencies.
diff --git a/requirements/py311.yml b/requirements/py311.yml
index 384398e76..00df5e422 100644
--- a/requirements/py311.yml
+++ b/requirements/py311.yml
@@ -18,12 +18,16 @@ dependencies:
 # Optional dependencies.
   - mo_pack
   - pip
+  - pre-commit
 
 # Test dependencies.
+  - codecov
   - filelock
+  - nox
   - requests
   - iris-sample-data
   - pytest
+  - pytest-cov
   - pytest-mock
 
 # Documentation dependencies.
diff --git a/requirements/py312.yml b/requirements/py312.yml
index ef2d96c3e..5fbd4be43 100644
--- a/requirements/py312.yml
+++ b/requirements/py312.yml
@@ -18,12 +18,16 @@ dependencies:
 # Optional dependencies.
   - mo_pack
   - pip
+  - pre-commit
 
 # Test dependencies.
+  - codecov
   - filelock
+  - nox
   - requests
   - iris-sample-data
   - pytest
+  - pytest-cov
   - pytest-mock
 
 # Documentation dependencies.
diff --git a/requirements/pypi-core.txt b/requirements/pypi-core.txt
new file mode 100644
index 000000000..0c3e69c5e
--- /dev/null
+++ b/requirements/pypi-core.txt
@@ -0,0 +1,2 @@
+scitools-iris>=3.0.2
+eccodes>=1.6.1
diff --git a/requirements/pypi-optional-dev.txt b/requirements/pypi-optional-dev.txt
new file mode 100644
index 000000000..a00c05de0
--- /dev/null
+++ b/requirements/pypi-optional-dev.txt
@@ -0,0 +1,2 @@
+mo_pack
+pre-commit
diff --git a/requirements/test.txt b/requirements/pypi-optional-test.txt
similarity index 70%
rename from requirements/test.txt
rename to requirements/pypi-optional-test.txt
index 8fc06edba..0fd077b3a 100644
--- a/requirements/test.txt
+++ b/requirements/pypi-optional-test.txt
@@ -1,7 +1,8 @@
-# Test dependencies.
-
+codecov
 filelock
+nox
 requests
 iris-sample-data
 pytest
+pytest-cov
 pytest-mock
diff --git a/requirements/setup.txt b/requirements/setup.txt
deleted file mode 100644
index 33d6aa017..000000000
--- a/requirements/setup.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-# Dependencies necessary to run setup.py of iris-grib
-# ---------------------------------------------------
-
-setuptools>=64