I thought I had it with the Tornado guess; British single engined fighter, more than twelve cylinders (Vulture), single prototype with counter rotating prop, radial brothers (Centaurus), flew a couple years before MB 5...
I'm totally stumped now
Very cool, thanks for that one Wuzak. Sorry about the poor quality of this one, but I'm on vacation and only have the crappy pictures on my phone to mess with.
Hope its not too easy!