THE head of the private firm at the centre of the Olympics security fiasco yesterday admitted he only realised just over a week ago that the task of supplying guards had been "underestimated".

Nick Buckles, chief executive of G4S, said he was "very sorry" that 3500 troops had to be drafted in at the last minute to make up the shortfall – some of whom have been forced to cancel leave and holidays after operational tours in Afghanistan.

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