Originally Posted by
possel
I would guess that was the Terrier 3 G-AVYK, which was completed by BEA apprentices in the 1970s.
Not quite.
G-AVYK was registered in 1967 and, like all Beagle Terriers, was a modification of a post-war ex-military Auster.
In this case it was a 1952 AOP6 whose conversion was abandoned by Beagle and subsequently completed by BEA apprentices at LHR, making its maiden flight on New Year's Eve 1968.