Pitlane walkabout is free - there's also loads of places to take photos with a bit of imagination, it's probably worth going on the Saturday, less crowds, and it'll be mainly practice and qualifying, leaving you free to enjoy the racing on Sunday. It should be good, all the titles are to be decided bar the Renault Clios.
It will be packed to bursting point! Usual inside of Druids (if its open - they closed it for DTM) Paddock Hill Bend etc.,
Clearways TV flap will be in use as BTCC is televised.
Isn't this round of BTCC on the GP circuit? In which case there's a huge amount of opportunities out the back. Much more so than some of the Indy corners already mentioned,
I'm sure they say that every year and it hasn't happened, but there you go...