Hi Sean,
Don't live in the ' The Big Smoke ' myself but only 30 miles up the M1 so have been down there a lot,
There are a couple just outside London, like one at Haynes -
http://www.londonmotormuseum.co.uk/
Brooklands is a bit far out for you at a guess but very good with planes too and right next door to Mercedes world.
http://www.brooklandsmuseum.com/
But within London although not a car museum as such but does contain ' mechanical stuff ' The Science Museum ' is worth a visit and a tube ride away.
http://www.sciencemuseum.org.uk/
If buses do it for you then at Covent Garden, worth a visit itself with street performers and Punch And Judy pub for a swift pint or two [;)], then there is London Transport Museum, only a tube ride away from where you are, don't be tempted to leave the station by step there over a 150 !!! use the very crowded lift or stay on to Charing Cross and walk round the corner -
http://www.ltmuseum.co.uk/
Shame not here next week as there is Classic Car night at the Ace Café on Tuesday and will poss. be there myself if it ever stops raining !
Enjoy your stay,
Cheers John


LIVE LIFE A QUARTER OF A MILE AT A TIME!
1976 Speke FHC Beauty Now with an overdrive conversion
1979 3.5 FHC(STATUS PENDING!!)
1982 2.0 DHC NOW A 4.6, BUILT NOT BROUGHT !!!!