Credit card provider Barclays suffered a technical fault earlier this week, which left many of its cash machines inaccessible to customers.
Bank users trying to log into online accounts were shown a "technical problems" page and advised to try later, while cash machines were unable to give out money after the bank experienced a technical glitch to its systems.
It is believed a computer failure in the bank's Gloucester offices led to the network crashing, with a bank spokeswoman stating a "hardware failure" was the cause.
People in London, the south of England and parts of south Wales were affected, including a number of credit card customers.
One female customer told the Daily Mail she had been unable to use her credit card abroad as a result of the glitch.
She said: "I'm currently abroad and can't use any of my cards - cash or credit - related to Barclays and when I called the bank I was told they are upgrading their system."
"I'm now stuck in a foreign country without any means of help and money until Barclays decide when I can access my account."
Apacs recently recommended that Brits heading abroad take various methods of payment with them, including prepaid credit cards.
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