I went to the trouble of making the UK flag look right on the UF1/UFR. It wraps around the top to the sides too, covering everything above the windows. Lining it all up was a bitch so I figured I'd put this here so no one else had to go through the work (assuming they look here :razz.

Up'd as a 2048x2048 .png to preserve transparency. I wouldn't use it by itself as it looks awful when the rest of the car is white.