Skipton Building Society has revealed details of a data blunder which led to customer details being sent out to over 3,000 other account holders.
The breach occurred when 3,115 savers received a letter from the UK's fourth largest building society with other customers' details erroneously printed on the back.
Letters contained the account number, balance, interest paid and surname and initial of other customers. The letters were annual statements the mutual sent out to 108,000 people in total.
Skipton spokeswoman Tracy Fletcher says the risk posed to affected customers is negligible.
"The details on the letters are not sufficient to allow unauthorised access to accounts," she says. "Importantly, customer addresses and transaction details were not disclosed.
"More importantly, these are passbook accounts - the customer has to go into a branch with identification and give a signature in order to withdraw money.
"So although we take the matter very seriously, it is important to stress there is little or no risk of anyone making unauthorised transactions on these accounts."
She adds Skipton has written to all affected customers stressing the negligible risk arising from the blunder. The building society has also told customers they can change their account numbers if they wish.
Fletcher says the mutual is hoping the FSA does not impose a fine.
"We wouldn't want to pre-empt what the regulator will do but we think given the proactive steps we have taken and the negligible risk to customers a fine should not be necessary."
The information breach comes on the back of Skipton's recent announcement 90 employees face losing their jobs.
"We are launching a voluntary redundancy programme and are making affected staff aware of other vacancies, so we hope the final figure will be less than 90," she says.
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