Pay day loan companies face scrutiny
21 November 2012 Last updated at 12:56 GMT
The pay day loan business is one of the few growth successes in the UK's struggling economy.
Fuelled by shrinking incomes at a time when banks are reluctant to lend, for some who have no other stream of credit, they have become the lender of last resort. And it can take less than 20 minutes for a pay day loan to arrive in your bank account.
The Office of Fair Trading has written to all 240 lenders to set out concerns about how some in the sector operate.
Jim Reed reports for Newsnight.