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Gilbert joined TSB in December 2013, shortly after the bank was separated from Lloyds, but before its sale to Spanish bank Sabadell in 2015.

He had previously been marketing director at Lloyds TSB from 2006, then was named group marketing director of Lloyds Banking Group in 2008, following the acquisition of Halifax Bank of Scotland.

Just a year later, Gilbert left the banking group, citing personal reasons. In 2011, he joined Virgin Media as chief marketing officer, later moving to the role of key projects director at Virgin Management. But less than a year into that role, he was lured back to TSB.

Writing for ±±¾©Èü³µpk10 in 2016, Gilbert said that working for Lloyds TSB during the economic crash had left him "disillusioned" by the banking sector - but that he had been enticed by the prospect of "creating a challenger from scratch" with TSB.

"Five cats", a recent animated campaign for TSB, created by Joint, aimed to position the brand in contrast to big five banks. Since then, that left customers unable to access their accounts.

Gilbert spent most of his career working agency side, culminating in eight years at Lowe and Partners Worldwide from 1998 to 2006, as global account director and then president Asia-Pacific.

Markey, meanwhile, joined TSB last June, after a year at Aviva, where he was brand communications and marketing director. He was previously marketing director at More Th>n, chief marketing officer at RSA from 2011 to 2014, and then chief marketing officer at the Post Office until 2016.

TSB’s treasurer Ian Firth and HR director Rachel Lock are also set to leave.

Paul Pester, chief executive of TSB, said: "Rachel, Nigel and Ian have been with TSB since the early days when we brought TSB back to high streets across the UK. I’m incredibly grateful for everything they have done to support TSB and I wish them all the best for the future."