And he is a businessman with credibility on Wall Street and an impressive record of re-engineering failing corporations.

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More recently, Gore's tendency to embellish his record has resulted in attacks on his credibility.

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"The governor's credibility is undermined by his insistence on over-spinning the record, " McMahon said.

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With such a short record of success, the central bank's credibility is still fragile.

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The deficit is down by a third (since 2010), a million and a quarter new private sector jobs have been created and the credibility we have earned means households and businesses are benefitting from near record low interest rates.

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The peripatetic Rogers, 63, who once set a Guinness World Record by riding his motorcycle around the world, brings a lot of credibility to the bull case.

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"Given that you do not have a record on which to be proud, I do not believe you have the credibility to suggest the ways in which the NHS can move forward today, " he wrote.

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Because of its long track record of delivering low inflation, occasional overshoots have not undermined the German central bank's credibility.

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