I've got Tiscali at home, total joke of an ISP and it's got a 12-month contract - avoid.
People seem to think IDNet are a good option - no traffic shaping/port throttling, 8Mbps download speeds (maximum - depends on your exchange and line quality/distance), excellent customer service, and a monthly contract.
Nildram also seem to be pretty good, as are Zen. You can afford something a little more expensive than £14.99 (which are all shite anyway - you get what you pay for) if there are a number of you living in the house together.
Warning: most ADSL ISP's seem to be throttling BitTorrent traffic these days (with a few exceptions, like IDNet).
Have a look at
http://bbs.adslguide.org.uk/ - there's forums there with people's opinions, or you could sign up and ask a question.
I'm a bit busy just now, sorry I couldn't have been more help. If you want more help, I'll probably be free later.
[hr]
" ... No-one knows what it's like, to be the bad man, to be the sad man, Behind Blue Eyes ... "