diff --git a/.github/workflows/test_functional.yml b/.github/workflows/test_functional.yml
index f055353d904..9cfb29d9fec 100644
--- a/.github/workflows/test_functional.yml
+++ b/.github/workflows/test_functional.yml
@@ -40,53 +40,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ['ubuntu-latest']
-        python-version: ['3.7']
+        os: ['macos-latest']
+        python-version: ['3.9']
         test-base: ['tests/f']
-        chunk: ['1/4', '2/4', '3/4', '4/4']
-        platform: ['_local_background* _local_at*']
-        # NOTE: includes must define ALL of the matrix values
-        include:
-          # latest python
-          - name: 'py-3-latest'
-            os: 'ubuntu-latest'
-            python-version: '3'
-            test-base: 'tests/f'
-            chunk: '1/4'
-            platform: '_local_background*'
-          # tests/k
-          - name: 'flaky'
-            os: 'ubuntu-latest'
-            python-version: '3.7'
-            test-base: 'tests/k'
-            chunk: '1/1'
-            platform: '_local_background* _local_at*'
-          # remote platforms
-          - name: '_remote_background_indep_poll'
-            os: 'ubuntu-latest'
-            python-version: '3.7'
-            test-base: 'tests/f tests/k'
-            chunk: '1/1'
-            platform: '_remote_background_indep_poll _remote_at_indep_poll'
-          - name: '_remote_background_indep_tcp'
-            os: 'ubuntu-latest'
-            test-base: 'tests/f tests/k'
-            python-version: '3.7'
-            chunk: '1/1'
-            platform: '_remote_background_indep_tcp _remote_at_indep_tcp'
-          # macos
-          - name: 'macos 1/5'
-            os: 'macos-latest'
-            python-version: '3.9'
-            test-base: 'tests/f'
-            chunk: '1/5'
-            platform: '_local_background*'
-          - name: 'macos 2/5'
-            os: 'macos-latest'
-            python-version: '3.9'
-            test-base: 'tests/f'
-            chunk: '2/5'
-            platform: '_local_background*'
+        chunk: ['1/1']
+        platform: ['_local_background*']
 
     env:
       # Use non-UTC time zone
@@ -194,21 +152,6 @@ jobs:
       - name: Configure git  # Needed by the odd test
         uses: cylc/release-actions/configure-git@v1
 
-      - name: Filter Tests
-        env:
-          # NOTE: we only want the CHUNK set in this step else we will
-          # re-chunk tests later when they run
-          CHUNK: ${{ matrix.chunk }}
-        run: |
-          etc/bin/run-functional-tests \
-            --dry \
-            ${{ matrix.test-base }} \
-            > test-file
-          if [[ $REMOTE_PLATFORM == 'true' ]]; then
-            # skip tests that don't configure platform requirements
-            grep -l --color=never REQUIRE_PLATFORM $(cat test-file) > test-file
-          fi
-
       - name: Test
         id: test
         timeout-minutes: 35
@@ -224,7 +167,7 @@ jobs:
           etc/bin/run-functional-tests \
               -j "${NPROC}" \
               --state=save \
-              $(cat test-file) \
+              tests/f/xtriggers/04-sequential.t tests/f/data-store/00-prune-optional-break.t tests/f/reload/26-stalled.t tests/f/triggering/08-fam-finish-any.t tests/f/flow-triggers/10-specific-flow.t tests/f/cylc-set/08-switch2.t \
               || (echo "finished=true" >> $GITHUB_OUTPUT && false)
 
       - name: Time Out
@@ -284,63 +227,8 @@ jobs:
           path: ~/cylc-run/
           include-hidden-files: true
 
-      - name: Fetch Remote Coverage
-        if: env.REMOTE_PLATFORM == 'true'
-        run: |
-          # pick the first host in the list
-          host="$(cut -d ' ' -f 1 <<< "${{ matrix.platform }}")"
-          # copy back the remote coverage files
-          rsync -av \
-            "${host}:/cylc/" \
-            '.' \
-            --include='.coverage*' \
-            --exclude='*' \
-            >rsyncout
-          cat rsyncout
-          # fiddle the python source location to match the local system
-          for db in $(grep --color=never '.coverage\.' rsyncout); do
-            sqlite3 "$db" "
-              UPDATE file
-              SET path = REPLACE(path, '/cylc/cylc/', '$PWD/cylc/')
-            "
-          done
 
       - name: Shutdown
         if: always()
         run: |
           etc/bin/swarm kill
-
-      - name: Combine coverage & report
-        run: |
-          coverage combine -a
-          coverage xml
-          coverage report
-
-      - name: Upload coverage artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: coverage_${{ steps.uploadname.outputs.uploadname }}
-          path: coverage.xml
-          retention-days: 7
-
-  codecov:
-    needs: test
-    runs-on: ubuntu-latest
-    timeout-minutes: 2
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Download coverage artifacts
-        uses: actions/download-artifact@v4
-
-      - name: Codecov upload
-        uses: codecov/codecov-action@v4
-        with:
-          name: ${{ github.workflow }}
-          flags: functional-tests
-          fail_ci_if_error: true
-          verbose: true
-          # Token not required for public repos, but avoids upload failure due
-          # to rate-limiting (but not for PRs opened from forks)
-          token: ${{ secrets.CODECOV_TOKEN }}