LLOYDS Banking Group yesterday launched an investigation into the IT failings that led to thousands of customers losing access to their cash on Sunday.
The glitch affected debit cards and ATMs from the Lloyds, TSB, Halifax and Bank of Scotland brands. They all use the same IT systems.
Paul Pester, boss of TSB, which is about to be sold off as an independent bank, said a server failure was to blame.
Pester added that he is working with Lloyds to try and stop the problem from recurring.
City watchdog the Financial Conduct Authority (FCA) has been in contact with Lloyds over the crash.
The FCA is already investigating rival bank RBS for its IT failures – the lender’s systems failed in summer 2012, spring 2013 and last month.
Both banks have complicated IT structures, in part because the lenders have expanded through a series of mergers and acquisitions.
Each new addition came with its own IT system to add to the groups’ existing infrastructures.