Labour leader Sir Keir Starmer has accused the Conservatives of producing a “Jeremy Corbyn style manifesto”.

Referencing the former leader of his own party, Sir Keir said the Tories had drawn up a document that would “load everything into the wheelbarrow” without explaining how to pay for it.

Sir Keir served in Mr Corbyn’s shadow cabinet but defended his criticism saying: “If you lose that badly, you don’t look at the electorate… you look at your party and say ‘You need to change’.”

The Labour leader’s comments came ahead of Rishi Sunak launching his manifesto at the Silverstone race track in Northamptonshire.

Mr Sunak said his manifesto showed that “our economy has truly turned a corner” and that his party’s policies would ensure “more British success stories”.

He said the measures were “fully funded and would result in lower borrowing in 2029-30”.

“Do not forget that Keir Starmer is asking you to hand him a blank cheque when he hasn’t said what he’ll buy with it and how much it is going to cost you,” he added.

Mr Sunak’s pledges include a new Help to Buy scheme to support first time buyers to purchase a home and a 2p cut in employee National Insurance.

Asked if he would match the Conservatives’ National Insurance tax cut, Sir Keir said the “money’s not there”.

He accused the Conservatives of using a promise to tackle tax avoidance to fund “at least four different propositions” adding: “That’s why I say it’s a Jeremy Corbyn-style manifesto.”

Mr Corbyn’s manifesto for the 2019 general election was a wide-ranging and ambitious proposal, including promises of free broadband for all and nationalisation of energy firms and the water industry.

Mr Corbyn has previously said Sir Keir should not “diss the past or diss his involvement in it”.

As well as comparing Mr Sunak to Jeremy Corbyn, Sir Keir also accused the prime minister of pursuing a similar approach to his predecessor Liz Truss.

He warned that “unfunded” commitments could crash the economy and that “if you lose control of the economy it’s working people who pay the price.”

The Liberal Democrat deputy leader Daisy Cooper said the Conservative manifesto wasn’t “worth the paper it’s printed on”.

“No one will believe anything they’re promising today,” she said.