| Zone A | All postcode areas in England & Wales |
| Zone B | DD, DG, EH, FK, G. KA (except KA27 & KA28), KY, ML, TD, AB 1 to AB 16. AB 21 to AB 25, AB 30, AB39, PA 1 to PA 19, PH 1 to PH 3 |
| Zone C | AB 31 to AB 38, AB 40 to AB 56, IV 1 to 28, IV 30 to 32, IV 36 & 40, IV 52 to 54, IV63, KW 1 to 14, PA 21 to PA 38, PH 4 to PH 41, PH 49, PH 50. Northern Ireland (BT) |
| Zone D | HS, IV 41 to 49, IV 51, 55 & 56. KA 27 & 28, KW 15 to17. PA 20, PA 41 to 49, PA 60 to 78, PH 42 to 44. ZE. Isle of Man (IM). Channel Islands |
| Zone E | Republic of Ireland * |