The government's plans for huge tax cuts, unveiled last week, have come under criticism after triggering nearly a week of financial market chaos including a sharp fall in the value of pound sterling .

Those tax cuts included a plan to scrap the 45% top rate of income tax applied to the highest earners. Britain's opposition Labour Party has pledged to restore the tax rate to 45% if it comes to power, saying tax cuts for the wealthy would not spur growth.

"Frustration doesn't come close – MPs are absolutely furious," The Telegraph quoted an unnamed ex-Cabinet minister as saying. "The 45p tax rate cut was completely unnecessary. It came at a high political cost for very little benefit."

Earlier on Thursday, Truss defended her plans to reignite economic growth and said taking urgent action to grow the economy meant "taking controversial and difficult decisions."