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NEWSMAKER-Challenging 'orthodoxy,' Kwarteng clings on after UK market rout

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Weeks into job, UK finance minister under fire over tax cuts

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Truss stands by key ally but some question his future

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Kwarteng fired key official, went without fiscal forecasts

By Sinead Cruise, Alistair Smout and Elizabeth Piper

LONDON, Sept 29 (Reuters) - As new British finance minister, Kwasi Kwarteng hoped to take down finance ministry groupthink that he and new Prime Minister Liz Truss saw as holding Britain back.

Instead he's seen his first fiscal statement take down the pound, the bond market, his party's reputation for financial credibility and quite possibly his own political career.

Truss was selected by Conservative members earlier this month to run the country on a low-tax agenda which vowed to challenge "Treasury orthodoxy" to get the country moving again.

Charged with delivering this vision, Kwarteng fired the finance ministry's most senior official and unveiled a swathe of unfunded tax cuts with a view of turning "the vicious cycle of stagnation into a virtuous cycle of growth".

What the 47-year-old unleashed was a vicious cycle of falling market confidence, flight from British assets and such damage to the British bond markets that the Bank of England was forced to start buying bonds.

A source at the Treasury said Kwarteng had no plans to resign or reverse any policies. Another person familiar with the situation said Truss was standing by her finance minister, whose official title is Chancellor of the Exchequer.

"The PM and the Chancellor are working on the supply side reforms needed to grow the economy which will be announced in the coming weeks," a spokesman for Truss said.

Investors, traders, government officials and even some lawmakers from the ruling Conservative Party are increasingly of the view that to fix the situation, there will have to be policy reversals or even Kwarteng's resignation.

One government source, who worked closely with Kwarteng in the past, told Reuters it was hard to see how he could survive. "He and Truss are close, and you have to wonder whether she is ruthless enough to axe one of her longest-standing allies this soon in her tenure."

The source noted that Truss had backed the plan throughout.

Support for the governing Conservative Party has sunk, a YouGov poll showed this week, with key planks of the economic plan unpopular with voters.

Keiran Pedley, a research director at pollster Ipsos, said early data showed the opposition Labour Party was increasingly more trusted to manage the economy, spelling danger for the government heading into the next election, expected in 2024.