Then I'll challenge that. I think it's a Healey-Abbott Drophead Coupé from somewhere between 1950 and 1954. 77 were built.
Edit: One thing I can say with absolute certainty is that the displacement of its engine is 2443 cc, and the car is actually from 1951 (registration date 24-01-51), whatever it is - which does make it less likely to be a Westland Roadster. To my knowledge, that was produced from 1946 to 1950 (obviously, it is possible that the car was registered later).