The chief executives of Britain's biggest firms are lasting less than four and a half years in their jobs.
Criticism over fat-cat pay and pressure from investors is threatening those bosses who fail to deliver, according to the financial web site Cantos.
The group said a quarter of FTSE-100 Index companies had appointed a new chief executive in the past 18 months.
Fifty-seven per cent of the top 100 bosses had been in the job for less than three years with only eight per cent in their post for more than a decade.
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