All places in Hertfordshire

B	Berkhamsted, Bishops Stortford, Borehamwood, Broxbourne, Bushey
F	Frithsden
H	Harpenden, Hatfield, Hemel Hempstead, Hemmel Hempstead, Hertford, Hitchin, Hoddesdon
K	Knebworth
L	Letchworth Garden City
P	PA Technology Centre UK, Potters Bar
R	Radlett, Rickmansworth, Royston
S	Sawbridgeworth, St Albans, St.Albans, Stanstead Abbotts, Stevenage
T	Tring
W	Ware, Watford, Welwyn, Welwyn Garden City