Okay. Not a Zero but a Mitsubishi Martlet, or Mahturetu as would be the Japanese pronuhciation
Taking the basic premise that the Anglo-Japanese Naval Treaty was maintained, we buy these for the FAA in 1941. Colours are actual IJN rather than FAA
I was going to do a 'Kate' in Vultee Vengeance markings (or a Fulmar scheme) to go with it, but that's another idea unfinished
Of course, there'd be confusion in the Channel when the190s appeared...