Kemi Badenoch used a speech in London on Thursday to accuse Andy Burnham of governing as though he were still the mayor of Greater Manchester rather than prime minister of the United Kingdom, calling on him to rule out tax rises at the autumn Budget.

The Conservative leader said Burnham had failed to explain how a series of measures announced during his first days in office could be paid for, describing the early promises as a "spending spree" (BBC News).

"Every day, Andy Burnham seems to float a new, expensive idea," Badenoch said. "We have seen this movie before. Tax rises are coming."

The speech marks an intensification of a running Conservative line of attack on the new prime minister. Badenoch expanded the critique in a Facebook post reported by Sky News, writing: "He is behaving like he's still the mayor of Manchester. He is now the prime minister of the United Kingdom. He needs to start acting like it" (Sky News via Facebook).

The framing is deliberate. Burnham served two terms as directly elected mayor of Greater Manchester before entering Downing Street, and Badenoch's language seeks to characterise his premiership as an extension of a regional civic style that, in her telling, does not scale to national government. She called on Burnham to rule out tax rises at the autumn Budget, narrowing the immediate political demand to a specific fiscal event.

A second Facebook post, published on 2 July, sharpened the rhetoric further. "Andy Burnham needs to stop wasting time giving empty speeches and running away," Badenoch wrote (Facebook).

On her official Instagram account, Badenoch struck a broader thematic note: "If we keep acting like it's a popularity contest, we will keep getting Prime Ministers who know how to get elected, but don't know how to govern" (Instagram).

The Conservative Party has been building this argument on its own platform for several weeks. An official article published on 29 June at conservatives.com carried Badenoch's warning that the country could not afford a repeat of what she characterised as a leaderless premiership. "We don't know, and we've seen the consequences of a Prime Minister without a plan with Keir Starmer," she said. "We can't let it happen again" (Conservatives.com).

Reuters reported on 28 June that Badenoch had pressed the same message at an earlier stage of Burnham's transition, telling him: "If he wants to be the leader of our country, it's time to start acting like it" (Reuters).

The Daily Express quoted Badenoch telling Burnham: "He needs to lift his sights. Because the world will not wait for Andy Burnham" (Daily Express).

The strategy is consistent across every channel Badenoch has used: the Commons, social media, the party website and the press. She is seeking to define Burnham's early premiership as fiscally reckless before the public settles on its own impression, and to bracket him with Starmer as a second consecutive prime minister lacking a substantive plan. The demand that Burnham rule out autumn tax rises is designed to force a binary choice: comply and accept the Conservative fiscal frame, or refuse and hand the Opposition a ready-made line of attack through the party conference season.

The line of attack also lets Badenoch sidestep detailed engagement with the substance of Burnham's individual policy announcements. By grouping them collectively as a "spending spree" and focusing on the funding gap, she keeps the political pressure on the question of fiscal credibility rather than the merits of any single measure.