Payday loans in the UK

The number of payday loans has grown in the UK recently: between August 2007 and June 2008, the number of loans made grew by more than 130%.
Unlike in many US states, in the UK there is no prohibition on "rolling over" lending. There does not seem to be a usury limit either: one UK company offers a "typical APR" of 1355%, although this takes compounding into account; without compounding the APR would be 300%. Advertising of payday lending is subject to the Consumer Credit (Advertisements) Regulations 2004. In particular, the "typical APR" must be stated in adverts which meet certain criteria, such as adverts which indicate that credit will be given to customers who may otherwise find access to credit restricted.
There has been some criticism of these loans in the UK recently. Vince Cable MP said "The growing popularity of these loans highlights the problems stemming from the credit crunch and unsustainable levels of personal debt in the UK.". Chris Tapp, of Credit Action, said in mid 2008: "Over the past year, payday loans have become an issue in the UK, and the growth in people who have problems who have such a loan has been notable in the last six months.".