I was a Marshal as well before we had kids. I loved doing the smaller events & some larger one's like F3,BTCC,F3000 & Truck GP(never the F1 GP)
I mainly spent my day's @ Brands but I also did Thruxton,Silverstone & Snetterton.
This was even after the ex owner of Brands Nicola Foulston had a right dig at marshals

I still have loads of happy memories, as I was mainly a pit marshal I got to meet Nick Mason,Dave Gilmour,Mika Hakkinen & Mike Salo (both many times) James Hunt, Nelson Piquet amongst others. I had a memorial meeting with Hugh Chamberlain on the pit wall @ Silverstone
I think you'll really enjoy iy!
I would go back to it again If I ever had enough of Brooklands