Locations
| Postcode Area | Postcode Area |
|---|---|
| AL1 St Albans | EN6 Potters Bar/Cuffley |
| AL2 St Albans/London Colney | EN7 Goffs Oak |
| AL3 St Albans (only Town – no villages) | EN8 Cheshunt/Waltham Cross |
| AL4 St Albans/Colney Heath/Sandridge | N11 Friern Barnet |
| AL6 Welwyn | N12 Finchley |
| AL7 Welwyn Garden City | N13 Palmers Green |
| AL8 Welwyn Garden City | N14 Southgate |
| AL9 Hatfield/Brookmans Park | N20 Whetstone |
| AL10 Hatfield | N21 Winchmore Hill |
| EN1 Enfield | NW7 Mill Hill |
| EN2 Enfield | SG3 Knebworth/Woolmer Green |
| EN3 Enfield | SG13 Hertford |
| EN4 Cockfosters | SG14 Hertford |
| EN4 Hadley Wood/Enfield | WD6 Borehamwood |
| EN4 East Barnet | WD7 Radlett/Shenley |
| EN4 Barnet | WD23 Bushey |
| EN5 Barnet | |