CONFIDENTIAL information about other bank customers was sent out to a woman who was trying to close her own account.
When Lisa Marie Cockroft received a letter from Yorkshire Bank, she found letters for two other customers inside the envelope.
The letters had the customers’ full names, addresses, account numbers and sort codes.
But the bank has insisted that there was no risk to those customers or the safety of their accounts.
Miss Cockroft said: “We’re trusting them with very important information and they have a total disregard for the safety of that information.
“These letters have gone from the main offices in Glasgow. It’s not just the local branch, it’s the bank as a whole.”
Miss Cockroft, 21, of School Grove, Dewsbury Moor, had been with Yorkshire Bank from the age of four.
“I started with a school account and I’ve been with them every since,” she said.
But after waiting months for the company to set up her online banking, she decided to switch banks.
Last Friday, a letter arrived from Yorkshire Bank, dated March 25.
At first, it looked as though three copies of the same letter had been sent – but when Miss Cockroft looked closer she realised that two were meant for other customers.
“They were for two men, one from Sheffield. It had their account details,” she said.
“I sent them letters with a covering letter saying what had happened. I didn’t want them to think I was withholding their information. I shouldn’t have had that.”
Miss Cockroft said she was worried that her own details had been sent to other customers.
She said: “How many times have they made the same error? How many other people’s details, or possibly my details, are in the hands of someone who might want to drain their accounts or isn’t honest enough to own up and say they shouldn’t have them?”
A spokeswoman for Yorkshire Bank said it took data protection matters very seriously and issues like this were rare.
“This is an unfortunate case of human error when packing the envelope, and we apologise to Miss Cockroft for any inconvenience this may have caused her,” she said.
“The information contained in the letters does not constitute a risk to those customers to whom they are addressed. We can confirm that, as Miss Cockcroft has received her letter, there is no issue around her own personal data.”