Apparently he followed the gyrocopter in his Landrover for 20miles to the airfield in order to confront the occupants. A gyrocopter has a non powered rotor & a powered propeller behind which is apparently what killed him.
I'm gonna tell the story how I read it, shoot me down in flames(sic)if you want.
Big bloke, hunt supporter(nice family man & part time thug)with all the gear, Barbour jacket & Landrover gets the 'ump with commie pinko hunt sabotuers. In fit of pique he charges onto airfield ready to tear pinko commies & their flimsy aircraft to pieces. Unfortunately he gets fatally whacked on't head with prop. Coppers ever on the side of the hunters & against pinko commie liberals(etc etc)arrest aviators on suspision of murder, I guess it will all get sorted in a couple of days & the 'copter back in the air with a new propeller.