Actually celebrated my 60th (a "few" years ago
) on the CSCC invitation race on the Brands GP circuit - it was a great weekend, since as CSCC are add-ons to the main event, we were first qualy on the Saturday (my birthday) and last race on the Sunday......so the party started after qualy, secure in knowledge that I'd be fine by 4pm or so on the Sunday
I really can't see the attraction of travelling the length of the country and braving the M25 to get dizzy on the Indy circuit, but the GP circuit is great. Shame its use is so proscribed.
Hope you have as good a time as we did!