Haldane, who is advising Prime Minister-to-be Burnham on growth, urged the country’s next leader to be “bolder and brassier”.

Andy Burnham is plotting a major policy speech next week to bolster his economic credentials as part of his Labour leadership run.

Andy Burnham, expected to become Britain's next prime minister after Keir Starmer resigned, has set out to reassure investors concerned that state spending and debt could rise…