David Fison has been replaced as chief executive of Skanska UK days after the company reported its results for the first half of the year.

Fison's departure follows problems in the UK PFI divison, where a write-down of £19.6m on PFI hospital proects in the second quarter brings the total write-down in the division to £47.6m so far this year. Fison took up the post of chief executive in 2001 after the departure of Keith Clarke.

As reported in Building, Construction News and Contract Journal, Fison has been replaced by Mats Williamson, former president of Skanska Sweden. Williamson joined Skanska in 1981, becoming president of Skanska Sweden in 2002.

The change at the top hasn't affected the company's prospects, however, with Construction News reporting that it is tipped to win deal worth up to £120m to build a Ministry of Defence facility in Cambridge. The deal, which would involve the conversion of existing facilites at RAF Wyton into new headquarters for miliary intelligence staff, is expected to be formally signed with Defence Estates by the end of the year.