You're the 2nd person in hours I've responded to who used TalkTalk. They have the same complaint. ie: TalkTalk shape bandwidth for p2p users. See ISP's known to BLOCK or Filter p2p or specifically Limewire & see the last link in the 1st post about UK ISP's that filter or block p2p.

BTW if the report came back as true then you're set up well. It's only your ISP that's the problem!