Outgoing Virgin Media chief executive Neil Berkett is to take over as chair ofGuardian Media Group. Berkett, a GMG non-executive director since November 2009, succeeds Dame Amelia Fawcett, who is retiring after more than four years in the chair. He is due to be replaced at Virgin Media later this month by Tom Mockridge when the cable company's £15 billion takeover by John Malone's Liberty Media is completed.