02 June, 2018
The bank HSBC said the "industry-wide issue" was affecting Visa payments, though ATM machines were still working.
Fellow payment card systems MasterCard and Maestro are not affected.
The credit card payment firm confirmed the service disruption in a statement, and said it is in the throes of establishing its cause.
The company has said Visa transactions are not being processed due to a service disruption. "We are investigating the cause and working as quickly as possible to resolve the situation", a spokesperson told Sky News.
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United Kingdom bank NatWest said it was also looking into reports of card payments being declined. She says that the outage has been coming in waves, so it is hard to know whether the cards will work or not.
Score of people took to social media to vent their frustration after the problem began around lunchtime on Friday.
Virgin Trains told one customer: "Unfortunately unless you have another form of payment then you wouldn't be able to get a drink".
Users of many United Kingdom banks have received alerts or messages informing them of a "disruption of service" which means they can not spend or receive money.