I vaugely remember a AAIB presentation that said something like
Airliner Accidents
1 in 1,000,000,000,000 sectors
GA
1 in 1,000,000
Ex-mil types (jets and props)
1 in 10,000
Gyrocopters
1 in 1
Numbers all made up by me as I cant remember the real stats but the ratios were something like that so hardly surprising that Duxford sees the odd incident. I guess its all part of the fun.