There is no doubt S2 CUD54K is a nice original looking car.
Built in March 1971, 0339P was first registered on 3rd September 1971.
It has a 1565cc engine, and according to the S2 registry it looks like from March 1971 onwards S2's had the larger 821-30 engine.
There were a few UK S2's built after it but not that many.