A group of TSB customers are to pay hundreds of pounds more in mortgage payments after the bank’s IT debacle spread to its lending business.

Since the end of April, customers have been experiencing a range of technical issues following an upgrade to the banks IT systems which has gone so badly chief executive Paul Pester is now facing calls to resign from MPs.

Many current account holders were the victim of a data breach which meant they could view each other’s account information and as many as 11,000 have been targeted by scammers.