Hi,
I have been a few times over the years, but not for say 6 or 7 years. In the past it's been a dirt cheap experience taking the van and a friend and just buying camping tickets for inside the circuit which I have done for next year. Have been able to wander around and was able to see loads without buying anything more.
Not sure now looking at the official site whether there are now whole sections you can't get to without general ticket as well - is that the case?
Many thanks