Most important for me is:

Get all tickets and paperwork out in time.
Not everyone lives in the UK so it can take a while to get it.
(Royal Snail can take up to a week to deliver to The Netherlands...)

It`s quite frustrating to drive 700 km and not having your tickets.

Also, lower the prices for food and beverages to a more normal level.
6 quid for a burger is just outrageous.

Also, do give a map with the tickets, as some places are not easy to find.
(the briefing room for instance, not very clear which building it is for a newcomer)