Um, Mark I think you meant "Euston" not "Victoria". Next time I see you, you'll probably be mispronouncing "Leicester Square" too
Pip, those UCL and SOAS dojos (both UKA affiliated) are nicely central and close to a bunch of tube stations (just minutes from Russell Square, Warren Street or Euston stations) -- check out the respective websites:
Bloomsbury (UCL)
Airenjuku (SOAS)