We got dropped off in Shoreham so didn't have to queue for the car park, although i spoke to a couple of folks who arrived between 9:30am - 10am and they said they only had to queue for about 10 mins to get in.
Might be different getting out, a lot of people headed for the exits after the vulcan had finished its display.
I've got to wait around tomorrow for Autoglass to turn up (12pm-6pm slot) but if they've been and gone by mid-afternoon, i'm going to drive down to North Lancing and park up on the hill behind Lancing College, see if i can watch the vulcan again.