diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 425e0a2f8c..6ade78290e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -115,6 +115,7 @@ jobs:
         BRANCH=${{ env.BRANCH }}
 
         cd covref
+        git pull origin coverage-reference
         git config user.name github-actions[bot]
         git config user.email "github-actions[bot]@users.noreply.github.com"
 
@@ -160,7 +161,7 @@ jobs:
           });
 
 
-  Sphinx-Pytest:
+  Pytest:
     runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
@@ -209,13 +210,6 @@ jobs:
         safety check || true
       shell: micromamba-shell {0}
 
-    - name: sphinx documentation
-      run: |
-        micromamba install ipykernel
-        pip install .
-        make -C doc html SPHINXOPTS="-W --keep-going"
-      shell: micromamba-shell {0}
-
     - name: pytest
       run: |
         pytest
diff --git a/.github/workflows/master_update.yml b/.github/workflows/master_update.yml
index 8ee44eeecd..a2ee25cc9e 100644
--- a/.github/workflows/master_update.yml
+++ b/.github/workflows/master_update.yml
@@ -14,7 +14,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v6
       with:
-        fetch-depth: 0
+        fetch-depth: 1
 
     - name: Substitute branch name in environment files
       run: |
@@ -39,20 +39,24 @@ jobs:
           pytest --cov=improver --cov-report=term --cov-report=html | tee coverage_output.txt; test ${PIPESTATUS[0]} -eq 0
       shell: micromamba-shell {0}
 
+    - name: Checkout reference coverage report
+      uses: actions/checkout@v6
+      with:
+        fetch-depth: 1
+        path: covref
+        ref: coverage-reference
+
     - name: Commit and push coverage report
       run: |
+        cd covref
         git config user.name github-actions[bot]
         git config user.email "github-actions[bot]@users.noreply.github.com"
 
-        git worktree add /tmp/coverage-ref coverage-reference
-
-        rm -rf /tmp/coverage-ref/master/
-        mkdir /tmp/coverage-ref/master/
-
-        cp coverage_output.txt /tmp/coverage-ref/master/.
-        cp -r htmlcov/ /tmp/coverage-ref/master/.
+        rm -rf master/
+        mkdir master/
 
-        cd /tmp/coverage-ref
+        cp ../coverage_output.txt master/.
+        cp -r ../htmlcov/ master/.
         git add -f master/
 
         # identify directories who's creation date is older than 14 days (excluding master/) and remove them
diff --git a/.github/workflows/scheduled.yml b/.github/workflows/scheduled.yml
deleted file mode 100644
index 4567731321..0000000000
--- a/.github/workflows/scheduled.yml
+++ /dev/null
@@ -1,171 +0,0 @@
-# Note that this file intentionally uses no cache, see
-# https://github.com/metoppv/improver/pull/1651#issue-1108889073
-name: Scheduled Tests
-
-on:
-  schedule:
-    - cron: '7 4 * * *'
-  workflow_dispatch:
-
-jobs:
-  Sphinx-Pytest-Coverage:
-    runs-on: ubuntu-22.04
-    strategy:
-      fail-fast: false
-      matrix:
-        env: [latest]
-
-    if: github.repository_owner == 'metoppv'
-    steps:
-
-    - uses: actions/checkout@v6
-
-    - name: Substitute branch name in environment files
-      run: |
-        # For scheduled runs, use the branch name (typically master)
-        BRANCH_NAME=${GITHUB_REF#refs/heads/}
-        echo "Using BRANCH_NAME: $BRANCH_NAME"
-        # Replace BRANCH_NAME placeholder in all environment files
-        sed -i "s/\${BRANCH_NAME}/$BRANCH_NAME/g" envs/latest.yml
-      shell: bash
-
-    - name: Environment creation
-      uses: mamba-org/setup-micromamba@v2
-      with:
-        environment-file: envs/${{ matrix.env }}.yml
-        init-shell: bash
-        cache-environment: true
-
-    - name: Environment info
-      run: |
-        micromamba info
-        micromamba list
-      shell: bash -el {0}
-
-    - name: sphinx documentation
-      run: |
-        make -C doc html SPHINXOPTS="-W --keep-going"
-      shell: micromamba-shell {0}
-
-    - name: pytest without coverage
-      run: |
-        pytest
-      shell: micromamba-shell {0}
-
-  Safety:
-    runs-on: ubuntu-22.04
-    strategy:
-      fail-fast: false
-      matrix:
-        env: [latest]
-
-    if: github.repository_owner == 'metoppv'
-    steps:
-
-    - uses: actions/checkout@v6
-
-    - name: Substitute branch name in environment files
-      run: |
-        # For scheduled runs, use the branch name (typically master)
-        BRANCH_NAME=${GITHUB_REF#refs/heads/}
-        echo "Using BRANCH_NAME: $BRANCH_NAME"
-        # Replace BRANCH_NAME placeholder in all environment files
-        sed -i "s/\${BRANCH_NAME}/$BRANCH_NAME/g" envs/latest.yml
-      shell: bash
-
-    - name: Environment creation
-      uses: mamba-org/setup-micromamba@v2
-      with:
-        environment-file: envs/${{ matrix.env }}.yml
-        init-shell: bash
-        cache-environment: true
-
-    - name: Environment info
-      run: |
-        micromamba info
-        micromamba list
-      shell: bash -el {0}
-
-    - name: safety
-      run: |
-        micromamba install safety
-        safety check || true
-      shell: micromamba-shell {0}
-
-  Type-checking:
-    runs-on: ubuntu-22.04
-    strategy:
-      fail-fast: false
-      matrix:
-        env: [latest]
-
-    if: github.repository_owner == 'metoppv'
-    steps:
-
-    - uses: actions/checkout@v6
-
-    - name: Substitute branch name in environment files
-      run: |
-        # For scheduled runs, use the branch name (typically master)
-        BRANCH_NAME=${GITHUB_REF#refs/heads/}
-        echo "Using BRANCH_NAME: $BRANCH_NAME"
-        # Replace BRANCH_NAME placeholder in all environment files
-        sed -i "s/\${BRANCH_NAME}/$BRANCH_NAME/g" envs/latest.yml
-      shell: bash
-
-    - name: Environment creation
-      uses: mamba-org/setup-micromamba@v2
-      with:
-        environment-file: envs/${{ matrix.env }}.yml
-        init-shell: bash
-        cache-environment: true
-
-    - name: Environment info
-      run: |
-        micromamba info
-        micromamba list
-      shell: bash -el {0}
-
-    - name: mypy
-      run: |
-        mypy improver || true
-      shell: micromamba-shell {0}
-
-  pre-commit-checks:
-    runs-on: ubuntu-22.04
-    strategy:
-      fail-fast: false
-    steps:
-
-    - name: improver checkout
-      uses: actions/checkout@v6
-      with:
-        fetch-depth: 0
-
-    - name: Set up Python
-      uses: actions/setup-python@v6
-      with:
-        python-version: 3.9
-        cache: 'pip'
-
-    - name: pip install pre-commit
-      run: |
-        pip install pre-commit
-
-    - name: Python interpreter version sha (PYSHA)
-      run: echo "PYSHA=$(python -VV | sha256sum | cut -d' ' -f1)" >> $GITHUB_ENV
-
-    - name: Cache pre-commit
-      uses: actions/cache@v5
-      id: pre-commit-cache
-      with:
-        path: ~/.cache/pre-commit
-        key: pre-commit|${{ env.PYSHA }}|${{ hashFiles('.pre-commit-config.yaml') }}
-
-    - name: pre-commit install
-      run: |
-        pre-commit install
-
-    - name: pre-commit run
-      run: |
-        pre-commit run --verbose --color=always --all-files
\ No newline at end of file
diff --git a/envs/latest.yml b/envs/latest.yml
index 0bf9d1df3c..cf85152d5a 100644
--- a/envs/latest.yml
+++ b/envs/latest.yml
@@ -36,10 +36,9 @@ dependencies:
   - pytest-cov
   - pytest-xdist
   - sphinx-autodoc-typehints
-  - sphinx-book-theme  
+  - sphinx-book-theme
   - sphinx-gallery
   - threadpoolctl
-  - pytest-xdist
   - pip
   - pip:
-    - git+https://github.com/metoppv/improver_example_data.git@${BRANCH_NAME}  
+    - git+https://github.com/metoppv/improver_example_data.git@${BRANCH_NAME}