Portcullis House is £41m over budget

The £234m building cost £28m more in real terms than original forecasts, and a further £13m went on legal costs and removal work before the bronze-clad building was opened in 2000.

Edward Leigh, chairman of the powerful Public Accounts Committee, complained that a number of risks had not been identified and that legal arguments over the window contract had cost too much.

He said: ‘We are still waiting for a satisfactory explanation for this, including who should be held personally to account for it.’

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