Plusnet broadband currently £6.49 per month, however use code 'offer' to get £1.50 off = £4.99/month for 12 months.
10gb allowance, plus unlimited overnight
8mb download speed
If you go through the TopCashBack cash back site you can get a further £40 cash back or £50 cashback if you take the phoneline too. This brings the cost down to £19.88 (£59.88 - £40 = £19.88). This works out to an amazingly low monthly rate of just £1.65!
Not sure if they are charging a connection/ transfer fee.
Also, not all BT exchanges are unbundled so may not be available where you live - check first!
I've got their broadband and phone line, works very well. But have to watch their expensive daytime phone call charges.
Offer is on until Thursday 8/07/2010 so be quick!