Another possibility is James Black's outfit Avia Special, based at White Waltham but operating out of various airfields during the summer inc Leicester and Sywell. Believe Tiger still OK for limited aeros if it has spin strakes fitted (the ex-military ones do, the civvies don't). Avia also do flights in Cap 10 and Zlin super-duper aerobatters, and very large and silly Antonov biplane freighter.