mysterygirl
Stealth visit from work
OK, looks the place to head for is called "Old Oaks" (http://www.theoldoaks.co.uk/). There's a bunch of festival folk staying there. They have sort of the same plan as you - be there for gate opening. So you can rise with the larks and all that.
A bunch of them will have already been out to the pub by the time you arrive, but I reckon that could work ok... cheery faces on arrival. And they're not too pissed, you might even trust them to help put your tent up.
There's also the Isle of Avalon campsite as well. We stayed there the Monday and Tuesday night before the festival last year. Reasonably priced, about a 15-minute walk from town, they do food, have an onsite shop and the toilet/shower block is immaculate!
I don't think Im going to be able to get there before they close.
I won't be able to get away from home until at least 7 I expect, possibly later. 10.30 is the last arrival, certainly for Old Oaks (couldn't find it for Isle of Avalon but I can't see it being much different tbh)