BTNG wrote:-
"Despite his complaining, he seemed to make a fair bit of dosh from the royalties."

Well, the houses in the part of Beckenham where he lived in the 1960s were very expensive and the two cars that were always parked in the drive or outside were pretty swish. I lived about 50 yards away in a rented student flat for some of that time in the only run-down divided-into-flats house in the area.