Greater London : main cities

Amersham, Banstead, Basildon, Billericay, Borehamwood, Brentwood, Chelmsford, Chesham, Cheshunt, Dartford, Epsom, Esher, Gillingham, Gravesend, Grays, Guilford, Harlow, Hemel Hempstead, Hoddesdon, Leatherhead, London, Loughton, Maidstone, Potters Bar, Reigate, Rochester, Saint Albans, Sevenoaks, Slough, Staines, Sunbury, Wattford, Wickford, Windsor, Woking.