diff --git a/.github/workflows/run-image-comparison.yml b/.github/workflows/run-image-comparison.yml
new file mode 100644
index 00000000..a23f9a60
--- /dev/null
+++ b/.github/workflows/run-image-comparison.yml
@@ -0,0 +1,59 @@
+# Run cf-plot tests including image comparison, in the reference environment
+name: Run image comparison testing
+
+on:
+  pull_request:
+    types: [opened, reopened, ready_for_review]
+    branches:
+      - main
+
+jobs:
+  test-image-comparison:
+    strategy:
+      fail-fast: true
+      matrix:
+        os: [ubuntu-latest, macos-15-intel]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout cf-plot
+        uses: actions/checkout@v7
+        with:
+          path: main
+
+      - name: Setup reference Conda environment
+        uses: conda-incubator/setup-miniconda@v4
+        with:
+          auto-update-conda: true
+          miniconda-version: "latest"
+          environment-file: main/cfplot-test-env.yml
+          activate-environment: cfplot-test-env
+
+      - name: Check reference environment
+        shell: bash -l {0}
+        run: |
+          python --version
+          python -c "import sys; assert sys.version_info[:3] == (3, 14, 8), f'Expected Python 3.14.8, got {sys.version}'"
+
+          echo "*Conda report:*"
+          conda info
+          conda list
+
+          echo "*Pip report:*"
+          pip --version
+          pip list
+
+      - name: Install cf-plot from source
+        shell: bash -l {0}
+        working-directory: ${{ github.workspace }}/main
+        run: pip install --no-deps -e .
+
+      - name: Run full test suite including image comparison
+        shell: bash -l {0}
+        working-directory: ${{ github.workspace }}/main
+        run: pytest tests
+
+      - name: Notify about a completed run
+        if: success()
+        run: echo "Image comparison testing completed successfully on ${{ matrix.os }}."
diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
new file mode 100644
index 00000000..f77670d3
--- /dev/null
+++ b/.github/workflows/run-tests.yml
@@ -0,0 +1,197 @@
+
+# A GitHub Action to run the cf-plot test suite after PR events on main.
+name: Run all testing excluding image comparison aspect
+
+# Triggers the workflow on PR events targeting main.
+on:
+  # For now, at least, do not enable on push to save on limited usage resource
+  #push:
+  #  branches:
+  #    - main
+  pull_request:
+    # 'reopened' enables manual retrigger via close & re-open. Disable for all
+    # edits to manage limited resource (PRs often change before merge-ready).
+    types: [opened, reopened, ready_for_review]
+    branches:
+      - main
+
+jobs:
+  # Test on Linux and Intel macOS.
+
+  # Test the suite on Linux (with Ubuntu as representative distribution).
+  test-on-linux:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        # DO NOT RUN on the latest Python, because we run this for the
+        # image comparison workflow so it would just be duplicating the
+        # same test.
+        python-version: ["3.11", "3.12", "3.13"]
+
+    steps:
+      - name: Checkout cf-plot
+        uses: actions/checkout@v7
+        with:
+          path: main
+
+      - name: Notify about setup
+        run: echo "Now setting up the environment for the cf-plot test suite..."
+
+      - name: Checkout the current cf-python main to use as a dependency
+        uses: actions/checkout@v7
+        with:
+          repository: NCAS-CMS/cf-python
+          path: cf-python
+
+      - name: Checkout the current cfdm main to use as a dependency
+        uses: actions/checkout@v7
+        with:
+          repository: NCAS-CMS/cfdm
+          path: cfdm
+
+      # Set up Conda for scientific Python dependencies.
+      - name: Setup Miniconda
+        uses: conda-incubator/setup-miniconda@v4
+        with:
+          auto-update-conda: true
+          miniconda-version: "latest"
+          activate-environment: cf-latest
+          python-version: ${{ matrix.python-version }}
+          channels: ncas, conda-forge
+
+      # Report the configured environment.
+      - name: Check conda and pip config
+        shell: bash -l {0}
+        run: |
+          echo "*Conda report:*"
+          conda info
+          conda list
+          conda config --show-sources
+          conda config --show
+          echo "*Pip report:*"
+          pip --version
+          pip list
+
+      # Install the scientific dependencies required by cf-plot and cf-python.
+      - name: Install dependencies
+        shell: bash -l {0}
+        run: |
+          conda install -c ncas -c conda-forge cf-python udunits2
+          conda install -c conda-forge mpich esmpy cartopy scipy matplotlib pytest
+
+      # Install cfdm, cf-python and cf-plot from source.
+      - name: Install development versions of cf* dependencies and cf-plot
+        shell: bash -l {0}
+        run: |
+          cd cfdm
+          pip install -e .
+
+          cd ../cf-python
+          pip install --no-deps -e .
+
+          cd ../main
+          pip install --no-deps -e .
+
+      - name: Notify about starting testing
+        run: echo "Setup complete. Now starting to run the cf-plot test suite..."
+
+      # Run the cf-plot test suite.
+      - name: Run test suite
+        shell: bash -l {0}
+        working-directory: ${{ github.workspace }}/main
+        run: pytest tests --skip-image-comparison
+
+      - name: Notify about a completed run
+        run: |
+          echo "The cf-plot test suite on Linux has completed."
+
+  # Test on Intel macOS rather than ARM64, which is not compatible with
+  # the existing Conda installation approach.
+  test-on-mac:
+    runs-on: macos-15-intel
+    strategy:
+      fail-fast: true
+      matrix:
+        # DO NOT RUN on the latest Python, because we run this for the
+        # image comparison workflow so it would just be duplicating the
+        # same test.
+        python-version: ["3.11", "3.12", "3.13"]
+
+    steps:
+      - name: Checkout cf-plot
+        uses: actions/checkout@v7
+        with:
+          path: main
+
+      - name: Notify about setup
+        run: echo "Now setting up the environment for the cf-plot test suite..."
+
+      - name: Checkout the current cf-python main to use as a dependency
+        uses: actions/checkout@v7
+        with:
+          repository: NCAS-CMS/cf-python
+          path: cf-python
+
+      - name: Checkout the current cfdm main to use as a dependency
+        uses: actions/checkout@v7
+        with:
+          repository: NCAS-CMS/cfdm
+          path: cfdm
+
+      # Set up Conda for scientific Python dependencies.
+      - name: Setup Miniconda
+        uses: conda-incubator/setup-miniconda@v4
+        with:
+          auto-update-conda: true
+          miniconda-version: "latest"
+          activate-environment: cf-latest
+          python-version: ${{ matrix.python-version }}
+          channels: ncas, conda-forge
+
+      # Report the configured environment.
+      - name: Check conda and pip config
+        shell: bash -l {0}
+        run: |
+          echo "*Conda report:*"
+          conda info
+          conda list
+          conda config --show-sources
+          conda config --show
+          echo "*Pip report:*"
+          pip --version
+          pip list
+
+      # Install the scientific dependencies required by cf-plot and cf-python.
+      - name: Install dependencies
+        shell: bash -l {0}
+        run: |
+          conda install -c ncas -c conda-forge cf-python udunits2
+          conda install -c conda-forge mpich esmpy cartopy scipy matplotlib pytest
+
+      # Install cfunits, cfdm, cf-python and cf-plot from source.
+      - name: Install development versions of dependencies and cf-plot
+        shell: bash -l {0}
+        run: |
+          cd cfdm
+          pip install -e .
+
+          cd ../cf-python
+          pip install --no-deps -e .
+
+          cd ../main
+          pip install --no-deps -e .
+
+      - name: Notify about starting testing
+        run: echo "Setup complete. Now starting to run the cf-plot test suite..."
+
+      # Run the cf-plot test suite.
+      - name: Run test suite
+        shell: bash -l {0}
+        working-directory: ${{ github.workspace }}/main
+        run: pytest tests --skip-image-comparison
+
+      - name: Notify about a completed run
+        run: |
+          echo "The cf-plot test suite on Mac has completed."
+          echo "You may now inspect the results."
diff --git a/README.md b/README.md
index edfc4ba2..a1e16683 100644
--- a/README.md
+++ b/README.md
@@ -95,6 +95,45 @@ More detail about installation is provided on the
 (`https://ncas-cms.github.io/cf-plot/installation.html`)
 of the documentation.
 
+### Testing
+
+To run the full test suite, call from the repo root:
+
+``` bash
+$ pytest tests
+```
+
+Note however this calls image comparison testing on plot outputs and exact
+image comparison depends on the environment (libraries and versions) used.
+So they may fail if your environment differs from that which was used to
+generate the reference images. Therefore, to allow like-for-like comparison,
+a specific testing conda environment is provided, ``cfplot-test-env.yml``.
+With this environment enabled, the image comparison should pass. Note we
+recommend use of `mamba` for environment creation/solving, but `conda`
+will also work.
+
+```console
+$ # Deactivate all other environments present first
+$ mamba env create --file cfplot-test-env.yml --name cfplot-test-env
+$ conda activate cfplot-test-env
+$ pytest tests
+```
+
+However you can disable this aspect with the ``--skip-image-comparison``
+or equivalently ``-I`` option to the cf-plot test suite run with `pytest`,
+so that only the functional tests run. This is advised when you use any
+environment other than the above, except where some library version
+differs for the purpose of regression testing on that versioning change.
+
+```console
+$ pytest tests -I
+```
+
+> [!NOTE]
+> More comprehensive testing across different environments is under development
+> but is not yet available. For now, use the reference environment to test with.
+
+
 ### Contributing
 
 Everyone is welcome to contribute to cf-plot in the form
diff --git a/cfplot-test-env.yml b/cfplot-test-env.yml
new file mode 100644
index 00000000..59a45c89
--- /dev/null
+++ b/cfplot-test-env.yml
@@ -0,0 +1,195 @@
+name: cfplot-test-env
+channels:
+  - conda-forge
+  - defaults
+dependencies:
+  - _libgcc_mutex=0.1
+  - _openmp_mutex=5.1
+  - aom=3.14.1
+  - arrow-cpp=24.0.0
+  - attr=2.5.2
+  - aws-c-auth=0.10.3
+  - aws-c-cal=0.9.14
+  - aws-c-common=0.14.0
+  - aws-c-compression=0.3.2
+  - aws-c-event-stream=0.7.1
+  - aws-c-http=0.11.0
+  - aws-c-io=0.26.3
+  - aws-c-mqtt=0.16.0
+  - aws-c-s3=0.12.6
+  - aws-c-sdkutils=0.2.5
+  - aws-checksums=0.2.10
+  - aws-crt-cpp=0.40.1
+  - aws-sdk-cpp=1.11.826
+  - blosc=1.21.6
+  - bokeh=3.10.0
+  - brotli=1.2.0
+  - brotli-bin=1.2.0
+  - bzip2=1.0.8
+  - c-ares=1.34.8
+  - ca-certificates=2026.9.25
+  - cached-property=2.0.1
+  - cached_property=2.0.1
+  - cartopy=0.26.0
+  - certifi=2026.7.22
+  - cf-python=3.21.0
+  - cfdm=1.13.3.0
+  - cftime=1.6.5
+  - cfunits=3.3.7
+  - click=8.5.0
+  - cloudpickle=3.1.2
+  - colorama=0.4.6
+  - contourpy=1.4.0
+  - cuda-cudart=13.0.96
+  - cuda-cudart_linux-64=13.0.96
+  - cuda-version=13.0
+  - cycler=0.12.1
+  - cytoolz=1.2.0
+  - dask=2026.8.0
+  - dask-core=2026.8.0
+  - distributed=2026.8.0
+  - donfig=0.8.1.post1
+  - exceptiongroup=1.3.1
+  - fonttools=4.67.0
+  - freetype=2.14.3
+  - fsspec=2026.9.0
+  - geos=3.14.1
+  - gflags=2.3.1
+  - glog=0.7.1
+  - google-crc32c=1.8.0
+  - h5netcdf=1.8.1
+  - h5py=3.16.0
+  - hdf4=4.2.15
+  - hdf5=1.14.6
+  - icu=73.2
+  - importlib-metadata=9.0.1
+  - iniconfig=2.3.1
+  - jinja2=3.1.6
+  - keyutils=1.6.3
+  - kiwisolver=1.5.1
+  - krb5=1.22.2
+  - lcms2=2.19.1
+  - ld_impl_linux-64=2.44
+  - lerc=4.1.0
+  - libabseil=20260526.0
+  - libaec=1.1.5
+  - libattr=2.5.2
+  - libavif=1.4.2
+  - libavif16=1.4.2
+  - libblas=3.11.0
+  - libboost=1.88.0
+  - libbrotlicommon=1.2.0
+  - libbrotlidec=1.2.0
+  - libbrotlienc=1.2.0
+  - libcblas=3.11.0
+  - libcrc32c=1.1.2
+  - libcurl=8.21.0
+  - libdav1d7=1.5.4
+  - libdeflate=1.22
+  - libedit=3.1.20260512
+  - libev=4.33
+  - libevent=2.1.13
+  - libexpat=2.9.0
+  - libffi=3.4.8
+  - libfreetype=2.14.3
+  - libfreetype6=2.14.3
+  - libgcc=15.2.0
+  - libgcc-ng=15.2.0
+  - libgfortran=15.2.0
+  - libgfortran5=15.2.0
+  - libgrpc=1.83.1
+  - libiconv=1.18
+  - libjpeg-turbo=3.2.0
+  - liblapack=3.11.0
+  - libmpdec=4.0.1
+  - libnetcdf=4.9.3
+  - libnghttp2=1.68.1
+  - libopenblas=0.3.34
+  - libopenjpeg=2.5.4
+  - libpng=1.6.59
+  - libprotobuf=7.35.1
+  - libre2-11=2025.11.05
+  - libsqlite=3.53.4
+  - libssh2=1.11.1
+  - libstdcxx=15.2.0
+  - libstdcxx-ng=15.2.0
+  - libthrift=0.23.0
+  - libtiff=4.7.2
+  - libudunits2=2.2.28
+  - libutf8proc=2.11.3
+  - libuuid=1.41.5
+  - libwebp-base=1.6.0
+  - libxcb=1.17.0
+  - libxml2=2.13.9
+  - libzip=1.12.1
+  - libzlib=1.3.2
+  - locket=1.0.0
+  - lz4=4.4.5
+  - lz4-c=1.9.4
+  - markupsafe=3.0.4
+  - matplotlib-base=3.11.2
+  - msgpack-python=1.2.3
+  - msgspec=0.22.0
+  - munkres=1.1.4
+  - narwhals=2.27.1
+  - ncurses=6.6
+  - netcdf4=1.7.3
+  - numcodecs=0.17.0
+  - numpy=2.5.4
+  - openssl=3.6.5
+  - orc=2.2.0
+  - packaging=26.3
+  - pandas=3.0.6
+  - partd=1.4.2
+  - pillow=12.3.0
+  - pip=26.2.1
+  - pluggy=1.7.0
+  - proj=9.8.1
+  - psutil=7.2.2
+  - pthread-stubs=0.3
+  - pyarrow=24.0.0
+  - pyfive=1.2.1
+  - pygments=2.21.0
+  - pyparsing=3.3.3
+  - pyproj=3.8.0
+  - pyshp=3.1.6
+  - pytest=9.1.1
+  - python=3.14.8
+  - python-dateutil=2.9.0.post0
+  - python_abi=3.14
+  - pyyaml=6.0.3
+  - rav1e=0.8.1
+  - re2=2025.11.05
+  - readline=8.3
+  - s2n=1.7.4
+  - scipy=1.18.0
+  - shapely=2.2.0
+  - six=1.17.0
+  - snappy=1.2.2
+  - sortedcontainers=2.4.0
+  - sqlite=3.53.4
+  - svt-av1=4.2.0
+  - tblib=3.2.2
+  - tk=9.0.4
+  - tomli=2.5.0
+  - toolz=1.2.0
+  - tornado=6.5.10
+  - typing_extensions=4.16.0
+  - tzdata=2026c
+  - udunits2=2.2.28
+  - umfive=0.4.0
+  - uritools=6.1.3
+  - xarray=2026.9.0
+  - xnetcdf=0.1.0
+  - xorg-libx11=1.8.13
+  - xorg-libxau=1.0.12
+  - xorg-libxdmcp=1.1.5
+  - xorg-xorgproto=2025.1
+  - xyzservices=2026.9.1
+  - xz=5.8.4
+  - yaml=0.2.5
+  - zarr=3.4.1
+  - zict=3.0.0
+  - zipp=4.1.1
+  - zlib=1.3.2
+  - zstd=1.5.7
diff --git a/tests/conftest.py b/tests/conftest.py
index 15e5c2a0..0eec97ae 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -3,8 +3,33 @@
 import sys
 from pathlib import Path
 
+import pytest
+
 # Ensure tests import the current checkout before any site-packages install.
 REPO_ROOT = Path(__file__).resolve().parents[1]
 repo_root_str = str(REPO_ROOT)
 if sys.path[0] != repo_root_str:
     sys.path.insert(0, repo_root_str)
+
+
+def pytest_addoption(parser):
+    """Add options for skipping certain aspects of testing, etc."""
+    parser.addoption(
+        "--skip-image-comparison",
+        "-I",
+        action="store_true",
+        default=False,
+        help="Skip reference image comparison while running tests.",
+    )
+
+
+@pytest.fixture(autouse=True)
+def skip_image_comparison(request, monkeypatch):
+    """Optionally skip reference image comparisons."""
+    if request.config.getoption("--skip-image-comparison"):
+        monkeypatch.setattr(
+            request.module,
+            "_assert_reference_match",
+            lambda example_id: None,
+            raising=False,
+        )
diff --git a/tests/integration/test_advanced_plot_examples.py b/tests/integration/test_advanced_plot_examples.py
index 36425459..a9ec922c 100644
--- a/tests/integration/test_advanced_plot_examples.py
+++ b/tests/integration/test_advanced_plot_examples.py
@@ -26,7 +26,7 @@
 TEST_GEN_DIR = (
     Path(__file__).parent.parent.parent / "generated-example-images-adv"
 )
-REF_IMAGE_DIR = Path(__file__).parent.parent / "reference-example-images"
+REF_IMAGE_DIR = Path(__file__).parent.parent / "v350-controlled-env-ref-images"
 TEST_GEN_DIR.mkdir(parents=True, exist_ok=True)
 
 
diff --git a/tests/integration/test_contour_plot_examples.py b/tests/integration/test_contour_plot_examples.py
index b3ac9721..090ecbee 100644
--- a/tests/integration/test_contour_plot_examples.py
+++ b/tests/integration/test_contour_plot_examples.py
@@ -26,7 +26,7 @@
 TEST_GEN_DIR = (
     Path(__file__).parent.parent.parent / "generated-example-images-cont"
 )
-REF_IMAGE_DIR = Path(__file__).parent.parent / "reference-example-images"
+REF_IMAGE_DIR = Path(__file__).parent.parent / "v350-controlled-env-ref-images"
 LOCAL_DATA_DIR = Path(__file__).parent.parent / "data"
 TEST_GEN_DIR.mkdir(parents=True, exist_ok=True)
 
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