Certain restrictions will apply to our postage costs. We cannot offer our unique flat rate to non-mainland addresses for any heavy items as the costs of sending via courier are high. . Restricted Areas: Northern Ireland (BT Postcodes). Islands and Scottish Highlands: (restricted postcodes:). IV, KW, ZE, HS, KA27-28, PH19-44, PH49-50, PA20-88, including all addresses within the Isle of Man, Isle of Wight, and Isles of Scilly. Please use this option to upgrade your postage if you intend to purchase large or heavy items to any of the above addresses.