I had another thought: as he died in Hastings in 2004 (where he retired to?) and was in Carshalton for some years (Electoral registers) in the 50s, 60s and 70s, maybe you could contact the local RAFAs to see if they know of him.
His generation were usually great supporters of RAFA, and he died less than 20 years ago, could still be some who knew him.....