We went to Castle Combe in August to a classic race weekend. Only cost £10 for a whole day solid of racing with some 60s classics Formula Ford open wheel racing and some modern classics & performance racing.
Would recommend it to anyone, its a great track and very good value.
Unfortunately there were no Calibras but plenty of other interesting stuff. 
I have some videos I took here:
https://www.youtube.com/user/tristandimond/videos?view=0&shelf_id=0&sort=dd