diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index e671ffc..45371ec 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -48,6 +48,15 @@ jobs:
         run: |
           git branch -f release-${{ github.event.inputs.environment }} HEAD
           git push -f origin release-${{ github.event.inputs.environment }}
+      - name: Run E2E tests
+        if: github.event.inputs.environment != 'prod'
+        uses: octokit/request-action@v2.x
+        with:
+          route: POST /repos/nationalarchives/tdr-e2e-tests/actions/workflows/ci.yml/dispatches
+          ref: master
+          inputs: "{\"environment\": \"${{ github.event.inputs.environment }}\"}"
+        env:
+          GITHUB_TOKEN: ${{ secrets.WORKFLOW_PAT }}
       - name: Send failure message
         id: slack
         uses: slackapi/slack-github-action@v1.18.0