I think you are talking about the wrong flag, I certainly remember a story about the Welsh Red dragon and English white dragon living in a cave(can't remember how it goes now but, the dragon was definatly white) perhaps the dragon got changed to yellow simply for looks, but the origanal dragon was white.    BTW with non-white Britons taking the St' George flag for the world cup and trying to turn it into a symbol of multi culturism this is actually a good idea me thinks(not that I mean to surrender the St George flag)