Thousands of people across the UK were charged twice for debit card payments following a glitch, which saw customers billed twice when paying via a card terminal operated by Cardnet, despite transactions only appearing once on receipts.

The error affected approximately 5% of payments made on machines on 29 August.

Cardnet is a payment system run by Lloyds Bank and card processor First Data, which handles about 1.1 billion transactions per year, including a large range of shops, restaurants and businesses across the UK. However, this has meant that Lloyds customers are not the only ones affected, as the machines accept most Mastercard and Visa payments.

Although customers should have been automatically reimbursed, they are urged to check their bank statements for duplicate payments.

A statement from Lloyds Bank said: “We anticipate that refunds to cardholders charged twice will be completed by Tuesday, September 4.

“Cardnet sincerely apologises for the issue and the inconvenience caused, we continue to work closely with all parties to resolve this issue swiftly.”

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