Isle of Man: All postcodes containing IM Scilly Isles: TR21-TR25 Scottish Islands: All postcodes containing KW / HS1-HS9 / IV41-IV49 / IV51 / IV55-IV56 / KA26-KA28 / PA20-PA80 / PH4-PH50 / ZE1-ZE3 Scottish Highlands: All postcodes containing AB and IV / KW1-KW14 / PA21-PA38 / PA80 / PH16-PH26 / PH30-PH41 / PH49-PH50 Northern Ireland: All postcodes containing BT Isle of Wight: PO30-PO41.