diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 00000000..f89e0ef5
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,18 @@
+name: Code style checks
+
+on: pull_request
+
+jobs:
+  javascript:
+    name: JavaScript
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
+      with:
+        node-version: 20
+        cache: 'npm'
+    - name: Install dependencies
+      run: npm ci
+    - name: Run linter
+      run: npm run lint:js
diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
deleted file mode 100644
index 25007486..00000000
--- a/.github/workflows/pull-request.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-name: Pull request
-
-on: 
-  pull_request:
-    branches:
-    - master
-  push:
-    branches:
-    - master
-
-jobs:
-  build:
-    name: Pull request
-    runs-on: ubuntu-latest
-    if: github.repository == 'nhsuk/nhsuk-prototype-kit'
-
-    steps:
-    - uses: actions/checkout@v4
-    
-    - name: Install dependencies
-      run: npm install
-    
-    - name: Run linting
-      run: npm run lint:js
diff --git a/app.js b/app.js
index a22dbd63..92ab106c 100755
--- a/app.js
+++ b/app.js
@@ -23,7 +23,7 @@ const routes = require('./app/routes');
 const utils = require('./lib/utils');
 
 // Set configuration variables
-const port = parseInt(process.env.PORT) || config.port;
+const port = parseInt(process.env.PORT, 10) || config.port;
 
 // Initialise applications
 const app = express();
@@ -53,7 +53,7 @@ const nunjucksConfig = {
 
 nunjucksConfig.express = app;
 
-let nunjucksAppEnv = nunjucks.configure(appViews, nunjucksConfig);
+const nunjucksAppEnv = nunjucks.configure(appViews, nunjucksConfig);
 nunjucksAppEnv.addGlobal('version', packageInfo.version);
 
 // Add Nunjucks filters
diff --git a/app/config.js b/app/config.js
index 537c2514..36fa24a2 100644
--- a/app/config.js
+++ b/app/config.js
@@ -10,4 +10,4 @@ module.exports = {
   // Automatically stores form data, and send to all views
   useAutoStoreData: 'true',
 
-}
+};
diff --git a/app/routes.js b/app/routes.js
index 9d8e3248..ee6db16d 100644
--- a/app/routes.js
+++ b/app/routes.js
@@ -15,15 +15,12 @@ router.post('/install', (req, res) => {
 
   if (install === 'Simple') {
     res.redirect('/install/simple');
-  }
-  else if (install === 'Developer') {
+  } else if (install === 'Developer') {
     res.redirect('/install/advanced');
-  }
-  else if (install === 'Download') {
+  } else if (install === 'Download') {
     res.redirect('/install/download-zip');
-  }
-  else {
-    res.redirect('/install')
+  } else {
+    res.redirect('/install');
   }
 });
 
@@ -33,11 +30,9 @@ router.post('/install/mac', (req, res) => {
 
   if (machine === 'Mac') {
     res.redirect('/install/mac/terminal');
-  } 
-  else if (machine === 'Windows') {
+  } else if (machine === 'Windows') {
     res.redirect('/install/windows/terminal');
-  }
-  else res.redirect('/install/mac-or-windows')
+  } else res.redirect('/install/mac-or-windows');
 });
 
 router.get('/download', (req, res) => {
diff --git a/package.json b/package.json
index ba07ef60..497eb1e7 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "test": "jest --coverage=true",
     "prewatch": "gulp build",
     "watch": "gulp",
-    "lint:js": "eslint -c ./linters/.eslintrc.js app.js middleware/**/*.js lib/**/*.js app/*.js docs/*.js"
+    "lint:js": "eslint -c ./linters/.eslintrc.js app.js middleware/**/*.js lib/**/*.js app/*.js"
   },
   "author": "https://github.com/nhsuk/",
   "license": "MIT",