Hi. You could go north towards Northampton and Wellingborough were you will find Santa pod raceway thats about 1.5hr from London or 78 miles. I dont know whats on this weekend though. 
Thanks, we ended up going there and spending 3 hours in the museum and the Merc dealership next door.Brooklands Museum at Weybridge/Byfleet. A great day out.
The RAF museum is a very interesting place and, although definitely pushing the Jaguar - Ford relationship too farAdmittedly not cars, but most car people I know find aircraft fascinating, so - RAF Museum at Hendon. You can get there by Tube, and if you're at all interested in aviation, it's well worth it.
Museums in London, Tourist Attraction London, RAF Museum Hendon
Excellent - did you walk up the piece of banked track that's still there?! It's great fun trying to climb to the top - very steep!! Not sure what the other cars were about - was it the annual London to Brighton classic car rally? I know the Caterham Owners Club always have a bit of a day out to go and watch that as I used to go.Thanks, we ended up going there and spending 3 hours in the museum and the Merc dealership next door.
Then on our way to Brighton we passed dozens and dozens of two seaters like Caterham, MGs and Triumphs.
Something must've been going on there.