Areas Covered

North London 

N2 - East Finchley, N3 - Finchley Central, N6 - Highgate, N10 - Muswell Hill, N11 - Friern Barnet, New Southgate, N12 - North Finchley, Woodside Park, N14 - Southgate, N20 - Whetstone, Totteridge, N21 - Winchmore Hill

North West London 
NW4 - Brent Cross, NW7 - Mill Hill, NW9 - Hendon

Harrow 
HA1-3 - Harrow, HA4 - Ruislip, HA5 - Pinner, HA6 - Northwood, HA7 - Stanmore, HA8 - Edgware

Enfield 
EN1-3 - Enfield, EN4-5 Barnet, EN6 - Potters Bar

Hertfordshire 
AL1 to 4 - St Albans,AL5  Harpenden, AL6 - Welwyn, AL7 to 8 - Welwyn Garden City, AL9 -10 - Hatfield, WD3 - Rickmansworth, WD4 - Kings Langley, WD5 - Abbots Langley, WD6 - Borehamwood, WD7 - Radlett, WD17 - 19 - Watford, WD23 - Bushey, WD24-25 - Watford HP1-4 Hemel Hempstead

Bedfordshire
LU1-6 - Luton