So where would a B-29 have been to be captured waist deep in snow, apparently with the bomb bay doors open, by an aeronautical draughtsman? Where were B-29's based in the UK (if at all)?
Could it be at
Burtonwood, which during Dec 1943 became the centre for overhaul and repair of all USAAF radial engined aircraft?
Just a guess, the linked site also has a list of
the UK airfields used by the American Air Forces from 1942 to the present day. So that would be a good place to start looking.
From Wikipedia Ref Burtonwood:
In November 1946 six B-29 Superfortress bombers from the USAAF Strategic Air Command 43d Bombardment Group were sent to Burtonwood, and from there to various bases in West Germany as a "training deployment". In May 1947 additional B-29s were sent to Burtonwood to keep up the presence of a training program. These deployments were only a cover-up, as the true aim of these B-29s was to have a strategic air force permanently stationed in Europe.
On 7 November 1953 the USAF 53d Weather Reconnaissance Squadron began operating from the base flying initially the WB-29 then WB-50D Superfortress, having been transferred from Kindley Field.
Cheers,
TSC.