That's a shame to hear, especially with all the open space around. I know your lovely location as I have a relation living at nearby Potters Bar. Indeed he has been lucky enough to fly with one of your members. I'd like to visit your strip but its too short for a PA28 - and I expect this is deliberate decision on your part !
Could the offending Robinson not use the old runways at Raydon for PFL's? I have no idea if they are in use by anyone.
Regards
BritishPPL