Parliament's influential Treasury select committee will on Wednesday grill executives of TSB after a bungled technology upgrade left thousands of customers unable to access their accounts.
Chief executive Paul Pester and chairman Richard Meddings have been summoned to appear before the cross party group, along with a yet-to-be named representative from TSB's Spanish parent company Sabadell.

The fiasco has dragged into its second week and committee chair Nicky Morgan on Monday published an exchange of letters with Pester.

Morgan wrote to Pester on April 24 to find out what has gone wrong, the extent of the failure, and how TSB intends to compensate customers who have suffered a breach of potentially highly-sensitive personal data.

In his response, Pester said TSB was working "around the clock to put things right for our customers", adding that no customer would be out of pocket as a result of the bank's failures.

Morgan said her committee was "extremely concerned by the problems at TSB".

"It's been reported that services such as online banking have been down for some TSB customers for over a week. Many individuals and businesses will have made arrangements for the planned outage, but not for the additional time that the systems have been unavailable," she said in a statement.

"We will take evidence from TSB and Sabadell representatives to find out how they got into this mess, who is responsible, and how they are putting it right."

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