Ignore my last post, although I was getting closer.
It's a 1951 Cooper-MG, but not as we know it. It was built by an employee at University Motors in Coulsdon, Surrey named Victor Percy Drew from a chassis he bought direct from the Cooper Car Co. and into which he fitted an MG XPAG engine. The registration was MYH24 and Mr. Drew registered it as a "Tonnelier" which is French for cooper in order to be exempt from purchase tax or some such excise duty. As one observer has pointed out, the body was designed to look like a Ferrari 166 barchetta, and was also the work of Mr. Drew. (The modern "technician" in the modern garage couldn't do that quality of work, I bet. You can't just plug into a computor.)