Unless you are on a stand arranged by the show organisers (power & style or ultimate car collection etc.) it doesn't really matter, we turned up about 11 one year lol the only limit is the public can't get in too early but those with club stand passes can turn up whenever they like (that's what its been the last few years anyway)
I'm not on track now so really don't want to be getting up at 5 if I can help it! Will try and get through on the phone tommorow and confirm we can arrive later and park on the clubstand. Will post up results!
Cheers!!! there seems to be a lot of different times!! I can imagine it will be a nightmare to get on the stand if people rock up at like 10.30