G-AKDB had quite a few owners according to ginfo.
it was registered to Dr Banks on two occasions the first being from 1950-1953 and again from 1958-1962. This seems a little strange.
From 1962 onwards it had 4 different owners until it was removed from the UK Register on 1 November 1970, as “Destroyed”.
Not necessarily strange - If Dr Banks spent large periods of his life working in different countries it seems logical that perhaps, before departing to spend time outside the UK, he sold the aircraft and on his return several years later bought it back again?
Just a thought.