Immigration Office HM phone Ternimal 3, London Heathrow Airport Hounslow, Greater London TW6 1NZ map Jobcentre Plus phone 10, Montague Rd Hounslow, Greater London TW3 1LL map if (!IN_DEV) { ?> } ?> UK Border Agency phone Terminal 4, London Heathrow Airport Hounslow, Greater London TW6 3XD map