Be Broadband is an award winning ISP and at the moment they have one of the best offers on broadband I've seen possibly ever. So much so that my housemate and I switched to it last week.
Their
Be Value internet is normally £13.50 a month, but until 31 December, it's only £6.75 a month.
It's up to 8mb, so fairly fast but the brilliant thing is that it's unlimited, so you can watch youtube videos and watch iPlayer as much you want without worrying about bandwidth and going over your limit
It's a minimum 12 month contract, but I guess you could cancel it after those 12 months and just have had Internet for only £6.50 a month.
If you haven't heard of
BE Broadband, I'd recommend doing some research on them as they continuously win awards for being one of the best ISPs, better than BT and Virgin!
Click here for details about their offer