Mitchell has not indicated when he will be departing his powerful position running Rupert Murdoch's national broadsheet or who his successor will be.

News, which publishes national broadsheet The Australian and tabloids The Daily Telegraph and Herald Sun, said the changes could take up to two years.

Thirteen per cent of readers of the country's only national broadsheet The Australian (also published by News Corp) said they weren't concerned about climate change.

It was as early as July 2016 when one British national broadsheet warned of "Brexhaustion", claiming the UK public were being crippled by Brexit fatigue.

Clennell chose to follow former editor Paul "Boris" Whittaker to the Australian and take on the role of NSW political editor for the national broadsheet.