Surcharge Guard UK lets you block checkout for customers in remote UK postcode areas — Scottish Highlands, Scottish Islands, Northern Ireland (BT), Channel Islands (GY, JE), Isle of Man (IM) and the Isles of Scilly. Toggle zones on or off in seconds. When a customer enters a blocked postcode, they see a clear, error message naming their exact area instead of a generic Shopify error. No theme edits. No scripts. The app works on every Shopify tier including Basic.

• One-click setup — toggle remote zones on or off, changes apply instantly
• Works on every Shopify tier including Basic
• Block checkout to configured remote zones
• Block checkout server-side - cannot be bypassed by customers
• Includes built-in postcode tester so you can verify behaviour before going live