Saw the clue...
Buckler cars
N.H.C.Special MK 53
Built Mar 1952
cycle wing E93A
I think I may have gone too far with helping out! You've found the car - well done, and one point to you.
I was getting frustrated by the lack of questions. Questions get answers, and answers lead to clues, and clues lead to solutions.
It was called NHC after the builder Norman Hallet Coates. I think there may be an error on that certain site with the details - I don't think there was a Mk53. I think it should be a Mk.5.