The first major security incident at the council happened in 2011 when salary details of 900 staff were released in error and posted on the internet.

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An HMRC spokesman said more staff were in place to tackle error and fraud than ever before and that HMRC had have "massively expanded" the number of checks it carries out.

BBC: Margaret Hodge tells HMRC to 'get a grip' on tax credit fraud

The Deputy said he felt like he had let down Housing Department staff, but did not feel his error was that serious.

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Mr Olmert's fatal error was to believe his chief of staff, a former air-force commander, who assured him that Hizbullah's thousands of short-range missiles could be dealt with in the same way.

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He wrote to IMF staff and said "while this incident constituted an error in judgment on my part, for which I take full responsibility, I firmly believe that I have not abused my position".

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Mr. Morsi's campaign staff and the High Presidential Election Commission also reported the printing error, but said the ballots were discovered and destroyed before voting began.

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Ms Lazzaris' problem stemmed from an error made by holiday giant Thomas Cook, where a member of staff had used the booking code for San Juan (SJU), Puerto Rico, instead of San Jose (SJO), capital of Costa Rica.

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In 2009, HMRC set itself a target of halving the rate of tax credit fraud and error from 9% to 5% by March 2011 and diverted around 400 extra staff to help with the effort.

BBC: Margaret Hodge tells HMRC to 'get a grip' on tax credit fraud

Staff at the three broadcasters said their computers crashed and could not be restarted, with screens simply displaying an error message, although they have continued to make television broadcasts, our correspondent said.

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