I am sure David George was involved with Sloane Aviation in the Hiller days. There is a nice story a friend of mine tells about trying to get the loan of a million pounds from David for a couple of weeks as he was sure David wouldn't miss a bit of interest on the money!!!!!
I thought David had dropped out of Sloane Aviation by the early 80's, but then formed Sloane Helicopters for the Robinson distributorship. Since then then two brands appear to have been reunited.