There were quite a few single-seat fighters being developed pre-war, but most of them never really saw the light of day. By about 1938 the RAF was very concerned at the slow pace of development and manufacture, and actually started looking overseas for a possible front-line 'reserve' fighter alongside the Spitfire, Hurricane and Defiant. I believe they came quite close to ordering some Reggiano-Caproni Re2000 fighters from Italy, a very good-looking aircraft with a better performance than the Hurricane, not quite as good as the Spit. Apparently, like many Italian aircraft, it was a complex and complicated design and difficult to maintain, so it all fell through. Probably just as well. The Italians designed some great-looking high-performance fighters, but could never manufacture enough of them.
I wish I could be woken in the morning by the sound of a RR Merlin....you lucky wotsit you!
Big Gee