Wycombe;
I witnessed that as I was flying in the GP shuttle from there at the time. There was also the C172/Seaking accident at St Mawgan.
I fly rotary for a living and am VERY conscious of the potential for upset that my wake turbulence may cause. A lot of smaller airfields may not realise due to infrequent heli ops. Err on the safe side and give anything above a Twin Squirrel a good wide berth.
Also a lot of smaller airfields don't realise that our downwash can easilly upset a light aircraft when we are taxiing around. Parking us close to a flightline is a recipe for damage, either by the downwash banging control sufaces about or FOD being thrown around.