Funny, I went to every British GP from 1972 to 1988 (some of those were at Brands Hatch) and it only rained at one of them, 1975 I think. The only GP I attended abroad was the Monaco GP also in 1975 and it lashed it down most of the time The 1972 GP at Brands cost me £5 entry fee (at the gate on the day) and 50p for a paddock pass, I believe it's £155 entry fee these days One of the problems with attending a British GP is the sheer scale of the number of spectators, back in the 70's it was around 40-50k, with maybe 10k attending practise ,nowadays its 120,000 and a course in the middle of nowhere with just one main road can barely cope even if the weather is perfect.
Pete