THE head of lifeline ferry operator CalMac is to take on responsibility for its parent company, David MacBrayne, following the sudden departure of its chief executive.

The state-owned company confirmed that Archie Robertson had stepped down on Friday following a series of bruising showdowns with Government ministers, hours after The Herald reported the story.

A spokesman said Martin Dorchester, the managing director of Caledonian MacBrayne who was appointed four months ago, will take over his boss's duties, though it was not clear whether the promotion would be permanent.

"Martin Dorchester, managing director of CalMac Ferries, has assumed the management responsibility for all of the groups activities," the spokesman said. He refused to say what the terms of the resignation were or how much had been paid in severance arrangements.

Confirmation that Mr Robertson had left came after he was officially described as being on annual leave for several weeks, during which time he missed a number of appointments with Scottish Government ministers.

Peter Timms, chairman of David MacBrayne, said: "On behalf of the board, I would like to thank Archie for his contribution to the business and wish him well for the future."

A spokeswoman for Government agency Transport Scotland spokesperson said: "The employment of the chief executive is an operational matter for the DML Board."