A letter signed by O’Neill, who is a Burnham adviser, urged the next Prime Minister to introduce sweeping reforms of the country’s tax system.

It won't be long before Burnham is this country's Prime Minister. Like me, I imagine you're not as titillated as Labour MPs are about the prospect of Burnham at the helm - and…

Tony Blair's institute said attempting to 'tax our way to prosperity' would be ' bad policy and bad politics'.