AL - St. Albans
GU - Guildford
HP - Hemel Hempstead
RH - Redhill
SL - Slough
WD - Watford
EN - Enfield
HA - Harrow
KT - Kingston-upon Thames
N - North London
NW - North West London
TW - Twickenham
UB - Southall
LU - Luton
MK - Milton Keynes
SG - Stevenage
OX - Oxford
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