I have seen it briefly mentioned in a couple of different places that the British painted the tops of the turrets of tanks and tank destroyers either yellow or white, depending on which corps or army they were attached to, in July 1944. My questions are, how widespread was this practice, which units used which colors, how long did they retain their markings, and does anyone have any pictures? I have only found one picture in the Hunnicut Sherman book that positively shows this paint scheme in use, and I'd like to use it to add some color to my new Dragon Firefly kit.
Thanks in advance!

I think they were painted as ID for the allied airforces to stop freindly fire there is a model built up in modelling the sherman which is published by osprey I'll tell you the unit thats in the book when I get from from work later