Balck and white camouflage was used from 39 until around June 1940 in order to make sure the AA guys know which aircrafts are friendly. Then they introduced the "sky" (duck-egg green) undersides. However, later on the black and white was re-introduced for a very short time from November 1940 to Spring 1941, and I'm not sure all the squadrons used it.
All in all, I'm not a big fan of having such a default skin
