UK backbenchers express 'head-in-hands despair' at Gavin Williamson promotion to senior Cabinet post

Latest: New Defence Secretary Gavin Williamson has said he is "both honoured and excited" by his promotion, following Sir Michael Fallon's resignation amid sleaze allegations.

Update 2.18pm: New Defence Secretary Gavin Williamson has said he is "both honoured and excited" by his promotion, following Sir Michael Fallon's resignation amid sleaze allegations.

The former chief whip's appointment by Theresa May to one of the Cabinet's most senior posts provoked widespread surprise at Westminster, as he has never before held ministerial office.