Four racist white teenagers were facing life sentences last night for the murder of an Asian taxi driver who was ambushed as he responded to a fare. Mohammad Parvaiz, 42, was stoned and battered to death after he inadvertently became caught up in a dispute between neighbours. He was lured to an isolated dead end, dragged from his cab and set upon by a gang armed with stones, bricks and fence posts. During the unprovoked attack they were heard shouting racist taunts as they rained blows and kicks on their defenceless victim. Minutes later Christopher Murphy, 18, who had stamped...