If you are looking for a top Cotswold airshow - you can't get better than Kemble.
Plenty of stuff for bored kids, decent varied airshow, big ice creams and handsome pilots (particularly that Chief Pilot of Deltajets chap).
I hate Fairford both from a participant pov and as a visitor on the ground - too big, too impersonal - and don't hold your breath for the Vulcan either!
KMB01