diff --git a/.github/workflows/test_fast.yml b/.github/workflows/test_fast.yml
index 1d268e90ef..0e00b5d07d 100644
--- a/.github/workflows/test_fast.yml
+++ b/.github/workflows/test_fast.yml
@@ -13,92 +13,13 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  test:
-    runs-on: ${{ matrix.os }}
-    timeout-minutes: 20
-    strategy:
-      fail-fast: false # don't stop on first failure
-      matrix:
-        os: ['ubuntu-latest']
-        python-version: ['3.8', '3.10', '3.11', '3']
-        include:
-          - os: 'ubuntu-22.04'
-            python-version: '3.7'
-          - os: 'macos-latest'
-            python-version: '3.9'  # oldest supported version
-          # non-utc timezone test
-          - os: 'ubuntu-latest'
-            python-version: '3.9'  # not the oldest, not the most recent version
-            time-zone: 'XXX-09:35'
-
-    env:
-      TZ: ${{ matrix.time-zone }}
-      PYTEST_ADDOPTS: --cov --cov-append -n 5 --color=yes
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Configure Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-
-      - name: Apt-Get Install
-        if: startsWith(matrix.os, 'ubuntu')
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y sqlite3
-
-      - name: Patch DNS
-        uses: cylc/release-actions/patch-dns@v1
-
-      - name: Install
-        run: |
-          pip install -e ."[all]"
-
-      - name: Configure git  # Needed by the odd test
-        uses: cylc/release-actions/configure-git@v1
-
-      - name: Unit Tests
-        timeout-minutes: 5
-        run: |
-          pytest cylc/flow tests/unit
-
-      - name: Integration Tests
-        timeout-minutes: 5
-        run: |
-          pytest tests/integration --ignore tests/integration/tui/
-
-      - name: Tui Integration Tests
-        timeout-minutes: 5
-        # Re-run failed Tui tests as they can be flaky
-        run: |
-          pytest tests/integration/tui || pytest tests/integration/tui --last-failed
-
-      - name: Upload failed tests artifact
-        if: failure()
-        uses: actions/upload-artifact@v4
-        with:
-          name: cylc-run (${{ matrix.os }} py-${{ matrix.python-version }})
-          path: ~/cylc-run/
-          include-hidden-files: true
-
-      - name: Coverage report
-        run: |
-          coverage xml
-          coverage report
-
-      - name: Upload coverage artifact
-        uses: actions/upload-artifact@v4
-        with:
-          name: coverage_${{ matrix.os }}_py-${{ matrix.python-version }}
-          path: coverage.xml
-          retention-days: 7
-
   lint:
     runs-on: 'ubuntu-latest'
     timeout-minutes: 10
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [3.9, 3]
     steps:
       - name: Apt-Get Install
         run: |
@@ -113,7 +34,7 @@ jobs:
       - name: Configure Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: ${{ matrix.python-version }}
 
       - name: Install
         run: |
@@ -130,32 +51,10 @@ jobs:
         run: etc/bin/shellchecker
 
       - name: MyPy
-        run: mypy
+        run: mypy --python-version 3.8
 
       - name: Towncrier - draft changelog
         uses: cylc/release-actions/towncrier-draft@v1
 
       - name: Linkcheck
         run: pytest -m linkcheck --dist=load --color=yes -n 10 tests/unit/test_links.py
-
-  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@v5
-        with:
-          name: ${{ github.workflow }}
-          flags: fast-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 }}
diff --git a/cylc/flow/scripts/dump.py b/cylc/flow/scripts/dump.py
index e8dc7fe2cb..fff4090d80 100755
--- a/cylc/flow/scripts/dump.py
+++ b/cylc/flow/scripts/dump.py
@@ -314,7 +314,7 @@ async def dump(workflow_id, options, write=print):
                             result += " (" + ",".join(attrs) + ")"
                         if options.show_flows:
                             result += (
-                                f" flows={item['flowNums'].replace(' ','')}"
+                                f" flows={item['flowNums'].replace(' ', '')}"
                             )
                         write(result)
 
diff --git a/cylc/flow/scripts/show.py b/cylc/flow/scripts/show.py
index d72a3e45d3..c387a3f3fc 100755
--- a/cylc/flow/scripts/show.py
+++ b/cylc/flow/scripts/show.py
@@ -355,7 +355,7 @@ async def prereqs_and_outputs_query(
                 if t_proxy["flowNums"] != "[1]":
                     ansiprint(
                         f"<bold>flows:</bold> "
-                        f"{t_proxy['flowNums'].replace(' ','')}"
+                        f"{t_proxy['flowNums'].replace(' ', '')}"
                     )
 
                 # prerequisites