Having lived in Grantham myself shortly after the pictures were taken, I am still trying to figure out whether the trucks are going North or South! Maggie Thatcher was still at school there then, by the way.

Someone’s been nibbling away at this helicopter during the last 3 years since I was there!

Hi gordo!
Spelling corrections here:
The two production test aircraft (201 and 202) were different in many ways from their four predecessors, necessitating repeating certain work to obtain certification. It was really these two aircraft that did the bulk of the flying that allowed the final certification of Concorde for airline service. However, even though called production aircraft, they never went into service because the final version, as specified by the airlines, was different yet again, although not in a way that affected handling or performance certification.
To protect their investment and keep prying eyes off what was very quickly becoming an eyesore, British Airways constructed a special hangar for G-BBDG. The “202 hangar” as it is affectionately known, was completed in early 1988. The aircraft (minus tail fin) was moved inside in May 1988.
As the aircraft was structurally sound, British Airways investigated, in the early 90’s, the possibility of refitting for airline service. This would allow the airline to keep a fleet of six or seven serviceable aircraft during engineering checks. The plan was found to be too costly and was rejected, although the study proved that if one of the seven BA aircraft suffered serious damage, parts from the damaged (and written-off) aircraft could be fitted to 202 and the airframe used to bring the fleet back up to strength, but there were doubts on certification, due to the fuselage skin being slightly thinner.

Probably a Super Aero 45, with two 105 hp Walter Minor 4-cylinder inverted in-line engines.