The nearest tube station is Canada Water station.
Romford doesn't have a tube station but the mainline station has a frequent service to London Liverpool Street. The nearest tube station is Upminster.
Camden Tube Station
Nearest to what
Leicester Square has its own tube station.
Arsenal
Westminster
69
Westminster or Waterloo
The nearest tube station is Waterloo.
Oxford Circus
The tube (underground) doesn't go out as far as Bexley but Bexley has its own rail station.