Updated 23 Feb 2011
If you are considering getting broadband or switching internet service provider in the UK, I can recommend Plusnet (a.k.a. Plus Net), who offer some market-leading deals both at the bottom and the top end of the market.
If you allow me to refer you to Plusnet, i.e. you quote my account details when you sign up, you can get your first 3 months completely free. More details are on this Plusnet referrals page. Here are the details you need to give during the online signup process (in the 'Were you recommended by a friend' section):
What is their username? sebwills
Who are they with? Plusnet
Promotional code (a bit further down the page or on the next page):
refer3
Cheers,
Seb