It failures at Lloyds Banking Group has resulted in customers at Lloyds, Halifax, Bank of Scotland and TSB being left without access to ATMs and debit card services.
A TSB executive said that failures at Lloyds IT servers had resulted in the errors, with Lloyds Banking Group apologising: "We apologise that earlier today, between 3pm and 6pm, some customers were unable to complete their debit card transactions.
UK banks struggle to upgrade old IT systems
The IT banking failure follows glitches effecting NatWest, RSB and Ulster Bank customers throughout 2013 which prevented the use of online services, use cards or withdraw money.
NatWest hit by further IT failings