Yes, looks like we're singing to the same song sheet. It was Brian Donald Hume, and he was known by his second given name. I presume he ended his days in a Swiss jail. I'm pretty sure the Auster still exists, but so far its identity has eluded me. I had G-AGYD in mind, but that was 'Mad Major' Christopher Draper's mount for his London Bridges escapade.
I remember seeing one of the Spartan Mossies that didn't get delivered rotting away at Hurn in the early 1960s. David O later became (and remains) a friend and now a colleague on AOPA's relaunched 'Geneeral Aviation' magazine, for which I pen the odd word. Small world.