Brian, seems you were correct, the museum called me back, as the event has become more popular, the museum have started to reserve areas behind the hangar, I have provisionally booked 10 places, we can add to that if required. Gates open from 9.30am, entrance from Brooklands Road, pre 1973 cars get a £1 off the entrance fee.
Can I suggest you send me an email (surreylancia@ntlworld.com) if you would like to come along to gauge numbers and I can arrange further spaces if required.