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http://www.bbc.co.uk/news/business-16002022

Some High Street banks are charging "eye-watering" rates of interest when their customers go over their overdraft limit, research by Radio 4's Money Box programme has revealed.

A customer borrowing £100 for 28 days without the consent of Santander would repay £200, for example.

That is the equivalent annualised percentage rate, or APR, of 819,100%.