I find this fascinating. I'd read before about how many in Wales were supporting England in that game. I was a 6 year old living in Germany at the time, but we were back visiting my parent's friends in London. All I remember was the stick we took after the game driving across London in a car with German plates. All good natured though (at least through the eyes of a 6 year old).
Something changed not so long after that, and the whole thing got nastier.