Certainly it's been done from Barton back in the past (70s & 80s) - just as with the foregoing horror stories, on one occasion they tried to do it from a C172 and the ashen remains spread over the entire interior of the aircraft.
Suffice it to say that the deceased was probably 90% committed to the maintenance dept's hoover bag and 10 destined to spend his afterlife coating the inaccesible areas of the cockpit of said 172. No, it wasn't the beloved GumBOIL you'll be relieved to know...
Quite a few others have had their ashes spread on the threshold/holding point (usually 27), thus contributing to the well-being of Barton's hardy grass and arguably strengthening up its boggy surface.
Me, I'd like a nice hillside somewhere, looking out over an area where the military do low level runs over some NIMBY farmers house...