Have you already got the line, or got it ordered?
if not, BT are doing a new installation for £29.99 till the end of September. 18-month contract though.
All non-LLU ISPs are available on that, including IDNet.
You could also look into
Plusnet. Theirs can run on that BT (Retail) line, or you could get one installed by them. If I read it right you could save money that way as well. Partly depending on your exchange and the package. They do have this
traffic management though.
My broadband basic info/help site - www.robertos.me.uk
My domains,website and mail hosting - Tsohost.
Internet connection - O2 Standard.