On the 14th February new rules from Ofcom (the industry regulator in the UK) require all ISPs to provide the Migration Authorisation Codes (Mac).  Some ISPs have been making getting the Mac very difficult, from the 14th they can be fined upto 10% of their annual turnover should they fail to comply with the new rules and not supply the mac code within 5 days of a request.

Uswitch.com has a lot of infomation about switching within many service industries including broadband, insurance, credit cards, loans and utilities.