CT220Surrey (within M25)
CT219Hertfordshire (within M25)
CT218Hertfordshire (within M25)
CT216Berkshire (outside the M25)
HC342CTYEssex
CT214SW London
STM210West London
STM214West London
STM212West London
STM207West London
STM205West London
STM206South West London
STM204South West London
STM213South West London
STM211West London
AW221Kent
AW220East London
STM201Central London
STM200West London
SI219Central London