Oh please Mr Expert, answer this one! I can't wait!
Problem Ranee is that MS has just started to promote TalkTalk so they can't exactly be "objective" any more.
As someone who has been in IT Support for in excess of 25 years and runs an IT Support Consultancy I can safely say that TalkTalk are as bad as Tiscali/Pipex. TalkTalk is owned by Craphone Whorehouse who also owns AOL. Unfortunately, they don't own the physical network, so they are parasites on BT's system.
If Broadband is important to your business or your life, then stay away from "cheap" as this is what you will get. There are only TWO Internet Service providers who own their own network in the UK, BT and Virgin Media (there is another out in the boondocks of Hull but that is not important here).
Personally, I would go for a BT service every time. The only problems we encounter are rare and only cost us ONE phone call as there is no-one else for them to blame.
SHARK!