Operational areas
Yeading
Iver
Denham
Harefield
West Watford
Oxhley
Hendon
Kentish Town
Kilburn
Barnet
St John's Wood
Golders Green
Earl's Court
South Kensington
Barnes
Mortlake
Putney
Twickhenam
Whitton
Hounslow
Hounslow West
Heston
Heathrow
Isleworth
Brentford
Richmond
Feltham
Hatton
Westminster
Kensington
Maida Vale
Notting Hill
Sheperds Bush
Borehamwood
Garston
Chalfont St Giles
Camden
Cricklewood
City of London
Enfield
East Barnet
Potters Bar
Chesham
Amersham
Kingston
Islington
East Finchley
Finchley
Finsbury Park
Highbury
Highgate
Hallowey
Hornsey
Crouch End
Muswell Hill
New Southgate
North Finchley
Archway
Southwark
Kennington
Windsor
Ascot
Bisham
Bourne End
Clapham
Vauxhall
Stockwell
Battersea
Balham
Tooting
Hampton
Ashford
Shepperton
Staines
Stanwell
Wraysbury
Egham
Central London
Kings Langley
Abbots Langley