Have had a quick search on the issue through good old Google, and have some decent info for anyone else using TalkTalk having the same problem. TT actually place a huge restriction on P2P downloads throughout the day. It is lifted at 1am, and is put back in place at 9am which is probably related to the peak/off peak thing. I'll probably be up working until 2am or so, so I'll give it a go to see what happens.