I would like to recommend a UK ISP. It is called Eclipse Internet and I have been with them for some months now. They only charge £14.99 a month for 8mbps DSL broadband which has always been reliable and fast. They have a very high monthly limit of 15gb peak and unlimited off-peak.
They have been great to me and I really do reccomend them. The first month of internet is free (so you could cancel if you didnt like it, but I really don't think you will). You get free set-up and a free modem too
For more info, check out there website: here
If you do end up signing up with them, please can you type in the referral code "JAMIEOLI22" on the sign up form. It would be mostly apressiated.