Easynet obviously, but they are significantly more expensive than Sky,
I have just signed up to Sky (not connected yet though). They are £7.50 a month unlimited if you take out their Sky Talk package. I think (from prices another user posted) this is £10 a month if you have Sky Talk but no Sky TV.
If (by some miracle) 2Gb per month download is sufficient then the broadband if free with the Sky Talk package.
If you don't want Sky Talk it is £5 a month extra on top of prices I have put above.
Our exchange like yours was unbundled by stealth, end of October they had no plans to do it, I check a couple of weeks ago and it was done. They haven't bothered putting flyers through peoples door or notifying existing customers they had done it. I am hoping that there won't be too many users on it, and that I will get good speeds etc.
I have recently been sent a couple of vouchers that I can give to friends which at £50 M&S voucher each if they sign up to Sky. If you have any friends or family already on Sky, I am sure they would be happy to give you one.
Currently with Talk Talk business (nee Freedom 2 Surf).
Switching to Sky.