Don't worry about the tickets - they
won't sell out.
Beer really is £5 per pint, so drink the wine if you can take it - its decent stuff (always ask for the local house wine in a half/one litre carafe - all good stuff, red/white/rose) and FAR cheaper than the ale - something to do with the tax I think. Beer from shops is ok, but make sure its chilled - warm beer in Perp is absolute shiiite.
The ground is a good 30 minute walk, but the weather will be warm and if you've got a bottle of wine (or cheap frog brandy and a bottle of coke
) its a gentle stroll. There is also a RL friendly bar just before you get to the ground - you can't miss it.
Enjoy - its a great experience!!!