Good day out. Free to get in, don't have to be a Club Lotus member to wander round, think you do to get on track, and places get taken up early as they're limited. CCombe is also quite noise restricted, so be prepared to 'invest' in an extra clamp on silencer from Merlin Motorsport if you've a noisy car (nice little earner, methinks).
It's a gentile track day, organised into short sessions (6 laps at circa 1:30 per lap, if I remember correctly). I think you'll normally get at least 2-3 sessions guaranteed.
Good to see cars getting used and Combe is a good venue for spectators.
As a track is quite quick in the dry and quite scary in the wet (though I've only attended and been passengered). Scary in wet 'cause it's a fairly open/fast circuit and if you get some bits wrong it can bite (Avon rise into Quarry).
Date according to
http://www.castlecombecircuit.co.uk/ is Sat 27th May
HTH,
Niall