Dr Will Cavendish, the influential director of health and wellbeing at the Department of Health, is departing for a new job at the Department for Energy & Climate Change. He will leave his current role on 11 September.

Cavendish, seen by many as the driving force in Whitehall behind the tobacco display ban and hard-hitting saturated fat initiatives, has been promoted to Director-General, with a remit for be international climate change and energy.

The Department of Health has not yet appointed – or advertised for – a successor to Cavendish and as yet no-one has been selected to fill in for the role.

Cavendish significantly beefed up his department of health role during his tenure. His remit already included obesity, alcohol, nutrition and food labelling, but last November Cavendish also took over overall responsibility for tobacco and drugs policy.

Described by an industry source as a “man on a mission”, Cavendish was seen as pro-legislation and a fervent advocate of public health initiatives, though he was said to have a good track record of working with the industry.