Gordon Brown is “seriously considering” creating a super-ministry covering energy and the environment, which would pave the way for the potential break-up of the Department of Trade and Industry, according to Whitehall insiders.

A blueprint for the radical shake-up of Whitehall is being drawn up as part of the chancellor’s planning for his first 100 days as prime minister. Mr Brown, keen to demonstrate he will adopt a more collegiate style as leader, is involving senior officials outside the Treasury – including Gus O’Donnell, the cabinet secretary – in the work on the restructuring.