In late 1943-1944 771 Squadron FAA based at Twatt in the Shetlands, was issued with a number of Boston and Havoc aircraft, mostly Turbinlites, for use on radar calibration and target simulation purposes for Home Fleet units preparing to deploy to the Pacific.
One of these was Havoc II AH507 "T8A" (Sturtivant calls it a Boston II but I think he is wrong on that). Air Britain does not record it as one of the many aircraft from that particular Havoc batch converted to Turbinlite configuration and it had previously served with 85 Sq so I conclude it was one of the aircraft fitted with