ISG’s construction managing director Alan McCarthy-Wyper has suddenly left the firm after just 18 months.

McCarthy-Wyper was brought in from Balfour Beatty Rail by ISG chief executive David Lawther in May 2013.

He was tasked with streamlining the struggling UK construction division.

McCarthy-Wyper cut overheads, shrinking the division into three regions.

But the construction division made a £1.2m operating loss this year after scraping in with a small profit in 2013.

Since the management shake-up two senior regional chiefs have quit ISG.

Northern lead Andy Mallice left to join Robertsons in June after nearly four years with ISG.

While former ISG south west director John Rawlinson joined GB Solutions as managing director of its new central and south west region after leaving last year.

Phil Brown, the ISG construction group risk director, has taken over in the interim.