Earl - love those last photos. As a kid I lived in Sywell through the '70s and spent much of my school holidays playing round the airfield industrial estate (it was the '70s..) and motel. I remember watching the 500s in awe and on one occasion having one of the Sloane engineers explain to me about its 'jet' engine - it was always my favourite helicopter after that!
Sorry for the nostalgia
DipDop
(btw I wonder what happened to the crop spraying Hillers that used to be parked there?)