Sir Hector Sants, Barclays' head of compliance and former chief executive of the Financial Services Authority, has taken a leave of absence after being diagnosed with "exhaustion and stress".
Sir Hector will continue to get his full salary while away, which is reported to be £700,000, as part of his package which is estimated to be worth £3m.
The ex-FSA boss stepped down until the New Year after he was told he would be risking serious consequences to his health if he kept working.
Sir Hector joined Barclays in January as head of its global compliance division, reporting directly to Barclays chief executive Anthony Jenkins. He was head of the FSA for five years, during the time of the financial crisis.
Sir Hector was knighted in the New Year's honours list for his services to finance. He was fiercely criticised by politicians during the financial crisis while at the head of the financial regulator for failing to provide adequate supervision.
Prior to his positions at the regulator and the Bank of England, he had held senior posts in the private sector, running Credit Suisse First Boston’s European operations
Lloyds Banking Group chief Antonio Horta-Osorio took two months off in 2011 due to stress.
Business 'Essentials' You Don't Need To Succeed
Originality(01 of10)
Open Image ModalAny Specialist Knowledge Of Your Sector (02 of10)
Open Image ModalJust look at Virgin boss Richard Branson, who is worth nearly £3 billion ($4.2 billion). Branson's Virgin Atlantic Airways soared to £1.73 billion ($2.7 billion) in value. Not bad for a guy whose previous experience was in the music business. He's said to have quipped "you don't need to know how to fly a plane to run an airline". To show that Virgin Airways isn't a one off, just look at his latest venture Virgin Galactic - offering customers the chance to blast off into space. Do you think Branson is a trained astronaut?
Lots of Money (03 of10)
Open Image ModalEmployees (04 of10)
Open Image ModalProfit (05 of10)
Open Image ModalThat's right, you don't even have to make a penny in profit to build up a major business.Instagram was snapped up by Facebook last year for $1 billion, despite never making a profit.Meanwhile, YouTube was bought by Google for $1.65bn in 2006 - despite the online video site never having made a profit.
Good Press (06 of10)
Open Image ModalAdvertising (07 of10)
Open Image ModalThe cast of Mad Men would be furious to hear this, but you don't need to fork out for big adverts to get customers mad about your business.Massive billboards may be nice to book, but are they really worth it to get the punters interested? With free social network outlets like Facebook and Twitter, you can advertise your business however you like. The internet means that a customer wanting what you have can stumble across you in the end. And when customers start to try out your business, the word-of-mouth spread can be all you need for its popularity to soar.
A Business Plan (08 of10)
Open Image ModalCharisma (09 of10)
Open Image ModalAn Office To Base Yourself In (10 of10)
Open Image ModalOffices rather can be a thing of the past, as business rates make running an office rather expensive for a young firm.With the spread of laptops and smartphones, you can take your "office" with you.