OCTA,
RIAT Fairford is on the weekend of 12-13 July as is Flying Legends at Duxford near Cambridge which I've been to in the past and is great to see Spitfires, Hurricanes & Mustangs etc. etc. flying. You could do Fairford one day and Duxford the next! What a great weekend!
Check out
www.militaryairshows.co.uk for further info
Good luck!