By Matt Gibson
Many customers of Lloyds Banking Group were left frustrated on Sunday as they were unable to use their cards or withdraw cash from ATMs.
An IT glitch caused debit card transaction difficulties for customers of Lloyds, TSB, Halifax and Bank of Scotland for a window of three hours.
There was also a problem for four and a half hours for the same customers using cash machines.
A spokeswoman for Lloyds Banking Group said on Sunday evening: "Although the majority of transactions were unaffected, we are very sorry for the inconvenience that this will have caused.
Customers encounter cash machine problems
"At the same time, some customers encountered problems at approximately half of our 7,000 ATMs.
"This was resolved by 7.30pm, and all of our ATMs are now working."
Some cash machines were unaffected by the problem, as were all online and telephone banking services provided by the group.
Chief executive of TSB, Paul Pester, tweeted that hundreds of people rang customer services to talk about the problem.
He said: "At one point we had 300 customers queuing to speak to the call centre - sorry if you couldn't get through."
Time needed to sort card transaction backlog
He added on Sunday night: "The cause of the problems at TSB is now fixed, but it'll take a while to sort the backlog.
"Thanks to all TSB colleagues who worked so hard this afternoon to fix the IT issues. Sorry once again to all our customers affected."
He said a server problem caused the disruption and added that all brands under the Lloyds Banking Group umbrella were affected because they share the same IT system.