Skins by Aelius

[kristorf]

Depending on the time frame for the manufacture/painting of the aircraft there were several versions of the night/day underside.
Some had only the port wing painted, some were the full half black while some had the aileron on the port side painted white and starboard painted black against an opposing black or white wing.

As for the roundel, I have no idea as to why there was the yellow ring around it, but again this differs on differant aircraft with some having a narrow band (as per ZP-A) and some having bands that extended to the leading edge.

RAF schemes can be, contrary to what some say, interesting, but you need to be prepared to dig for them.