The earlier post titled as this one has been closed because it was hijacked into an argument that was irrelevant to the original question.
I was called by BT tonight, and was astounded to find thier new traffic managemetn policy very clearly explained on their web site. Broadband usage policy
Wow. This says the only type of traffic that is slowed down, and only at peak times, is P2P. Great - from what I read most of that is illegal file sharing anyway.