The caption next to the photo on the Turner stand at the N.E.C. said as follows:
QUOTE
Jack's first foray into car production was building eight chassis supplied with a choice of engines, which the customer would have bodied to their own taste. One of the chassis became a Formula 2 racing car for John Webb (of Webb Corbett fame). The picture shows chassis No. 5 supplied to Ron Hill, whose company Hills Fibreglass Developments of Wednesfield produced the body.
UNQUOTE
Now I understand that the first Turner chassis were 1951/1953 and I don't believe that this body could date from then. The chassis might have done, and the car might have been rebodied much later as has been suggested. The caption might not even have referred to the puzzle photo, but there wasn't another one nearby that it might have referred to!
So it seems to be the car that sits on Turner chassis no.5 dating from 1952/3 rebodied later but don't know if the caption refers to the later body or its original one.
For those who don't know Webb Corbett they produced high-quality cut-glass crystal.