Payday firms say they make careful affordability checks. These are supposed to ensure the companies don't lend more than a borrowers can repay.
But today they admitted to a worrying blind spot. It's possible for someone to take out a series of short term loans all around the same time, without the payday firms realising the individual is becoming over-stretched.
The spokesman for Mr lender, Adam Freeman, admitted it could be 60 days before they get the information. Wonga's Henry Raine agreed that better data sharing is needed to plug the information gap.
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"You are one of the silence breakers and we all owe you a debt of gratitude."
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A cut in stamp duty to help first-time buyers is likely to push prices by at least the amount the reduction is supposed to save, MPs said.