British Prime Minister Liz Truss was forced on Monday into a humiliating U-turn, reversing plans to cut the highest rate of income tax that helped to spark a rebellion in her party and turmoil in financial markets.

Truss, and her finance minister Kwasi Kwarteng, announced a new "growth plan" on Sept. 23 that would cut taxes and regulation, funded by vast government borrowing to snap the economy out of years of stagnant growth.

But the plan triggered a crisis of investor confidence in the government, hammering the value of the pound and government bond prices and jolting global markets to such an extent that the Bank of England had to intervene with a £65 billion ($73 billion) program to shore up the markets.