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Sir Mel Stride, Conservative shadow chancellor, will on Thursday apologise for the chaos unleashed by Liz Truss’s ill-fated “mini” Budget in 2022 and plead for time to be allowed to rebuild the party’s economic reputation.

Stride’s speech is an acknowledgment of the bleak political legacy of the 49-day Truss premiership, admitting: “The damage to our credibility is not so easily undone.”

But it is also a plea to his party to be patient, in spite of the Tories’ grim opinion poll rating, and to allow him time to forge “a credible plan” on the economy. “Over the next four years, our party will do just that,” he will say.

Many Conservative MPs are already speculating that party leader Kemi Badenoch may not survive in her post much beyond next summer’s local elections, and they may not give Stride four years to flesh out his plan.

Stride, speaking in London, will say that the Truss “mini” Budget had for a few weeks in 2022 “put at risk the very stability which Conservatives had always said must be carefully protected”.

The fiscal event of September 23 2022 spooked markets with its £45bn in unfunded tax cuts, triggering a jump in UK government borrowing costs, a fall in sterling to its weakest-ever level against the US dollar and a crisis in parts of the pension system.

Today the Truss economic legacy, which she insists was far less malign than her critics suggest, hangs over the Conservatives, and Stride will say it “requires contrition”.

He will add: “Let me be clear: never again will the Conservative party undermine fiscal credibility by making promises we cannot afford.”

Nigel Farage, who last month laid out a series of sweeping pledges to slash taxes and increase spending if his rightwing populist Reform UK party won power, is making the same mistake, Stride will say.

Stride, a former businessman and Tory work and pensions secretary in Rishi Sunak’s government, is seen as a solid and reassuring performer in an era of TikTok videos and social media — a point to be recognised in his speech.

“Our modern digital world has many advantages but, in some ways, it has ushered in the death of what we might call the Age of Thoughtfulness,” he will say, calling for his party to think deeply on the economy.

“To win that fight, we will need thoughtfulness,” he will say, arguing that the Tories have to embrace “stability and fiscal responsibility, with control of spending and reform of welfare and public services”.

He will add: “We will need to take our time if we are to forge a credible plan that delivers for the people of our country.”

Some in the Conservatives are more restless for change, given the party’s wipeout in English local elections in May and opinion poll ratings dipping below 20 per cent.

Robert Jenrick, shadow justice secretary, has embraced TikTok and social media and is seen by many Tory MPs to be continuing his run for the party leadership, in spite of losing to Badenoch in last year’s contest.