Non-Driver,
The line will always be provided by BT, that's the nature of the UK market... Openreach provide the cables for metal based broadband.
The difference is in what happens when the physical line reaches the exchange. 98% of broadband providers just resell BT's broadband product, which is, well, pretty rubbish.
What you want is a LLU service. TalkTalk do provide LLU, but not on all exchanges, is your TalkTalk service LLU or BT based ? (might need to ask them to be sure, because if you've been with them 5 years, you may have never switched from BT to LLU on their network).
If you are on TalkTalk BT, ask them to switch you to LLU and see how that goes. Otherwise you might try a short term contract with another LLU provider to see how that goes.
I wouldn't waste your time with BT infinity..... being on the end of a telegraph pole you're obviously at an "in the sticks" part of their network where they've got a healthy monopoly and won't be in a rush to provide a decent service.
Last edited by mixture; 20th Nov 2012 at 21:37.