Prime Minister Andy Burnham is facing pressure over public spending following criticism from Conservative leader Kemi Badenoch and warnings from allies about the country's fiscal strategy. Badenoch branded Burnham a "spendthrift" who "wants to say yes to everyone" and questioned the funding for his promises.

Burnham, who recently took office, highlighted his administration's delivery of two tax cuts, including the removal of VAT from energy bills. However, he has not ruled out potential tax increases in the upcoming Budget, amidst concerns that rising government borrowing costs could create a significant deficit.

Jim O'Neill, a former minister and economist who has advised the prime minister, warned that the UK could be "punished" by markets for a lack of a "sensible fiscal strategy," potentially leading to higher mortgage rates. O'Neill stated that Burnham must "get real" on issues like welfare and state pensions, and that the prime minister's recent parliamentary address was not what markets wanted to hear.

"If your country is under the focus of 'can they come up with a sensible fiscal strategy' on a day when the markets think 'well no, you're not showing any sign of it', you're going to have a tough day," O'Neill told LBC. "If it stays like this, your mortgage rate is going up."

Interest rates on government bonds, known as gilts, increased during Burnham's statement to Parliament. While global factors such as the Iran war, persistent inflation, and potential AI market bubbles have contributed to rising debt costs worldwide, the UK is perceived as particularly vulnerable.

Chancellor John Healey may need to implement tax hikes or spending cuts totaling up to £14 billion to stabilize public finances before the Budget on October 28, according to some experts.

Badenoch asserted that "The markets are clearly worried that we now have a spendthrift Prime Minister who wants to say yes to everyone but cannot tell us where the money is coming from." She added, "He needs to pay for all his new promises, and he has a choice: higher taxes, more borrowing or spending cuts."

Sir Howard Davies, former chairman of NatWest, described the period leading up to the Budget as "a very dicky period." While he indicated the recent bond sell-off did not signify a "major crisis of confidence in the UK Government," he acknowledged that concern over Burnham's approach to public spending could be causing "market jitters."

"Yes, I think it is," Davies told BBC Radio 4's Today programme when asked if market jitters were linked to Burnham's spending plans. "I think we're going to see a very uncertain period for the next three or four weeks, and it would be helpful if the Government could make some signs about their overall approach to the fiscal balance."

Conservative Leader Kemi Badenoch responded after Mr Burnham made a statement to MPs in his first appearance in the House of Commons since becoming PM on Tuesday