My Little Demon & Enchanted Kiwi - the Bowl of Brooklands does have seats. It's a mix of seats on the lake edge and a grass "Bowl" ... hence the name
I have been to shows both standing (well, picnic-ing I guess...) and seated. They put in extra seats for Elton John and if you look on the web you will see they are doing same for Cliff Richard there.
It is a super cool place and I recommend taking the walk through the park to get to the gig like the locals do. We will be a few car loads imposing on our friends there so there will be full houses bursting to the seams!!
30 years! I can't wait!!