The Bank of England has launched a temporary bond-buying programme as it takes emergency action to prevent “material risk” to UK financial stability.

It revealed that it would buy as many long-dated government bonds as needed between now and 14th October in a bid to stabilise financial markets in the wake of the mayhem that followed the government’s mini-budget last Friday.

In addition to the plunge in the value of the pound, it has also seen investors demand a greater rate of return for UK government bonds – essentially IOUs.

That is because the level of borrowing required to fund the government giveaway, including tax cuts and energy aid for households and businesses, shocked the market which immediately questioned the sustainability of the public finances.

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The International Monetary Fund has since added its voice to criticism of the growth plan.

What the Bank’s action is aimed at doing is tackling consequences of rising bond yields, in this instance a liquidity crunch facing pension funds.

The Bank said in a statement: “Were dysfunction in this (long-dated bond) market to continue or worsen, there would be a material risk to UK financial stability.

“This would lead to an unwarranted tightening of financing conditions and a reduction of the flow of credit to the real economy.”

The programme marked the Bank’s first policy intervention as it battles to bring down inflation and ease the cost of living crisis. Its chief economist signalled on Tuesday that a “significant” rise in Bank rate was also likely ahead.

The government’s growth plan is only seen as adding inflationary pressure to the economy, leaving it at loggerheads with the Bank’s mandate.

The Bank said the bond purchases, which would be fully covered by the Treasury in the event of any losses, would be sold back once market conditions had stabilised.

The announcement certainly had an immediate effect on the market.

Data showed that 30-year bond yields fell back to 4.3%, having risen to levels above 5% not seen since 2022 earlier in the day. There were similar falls for 20-year yields.

Those for ten-year bonds also fell back below 4% from 4.6%.

Stock markets, which had endured widespread falls Europe-wide amid recession fears, erased some of their losses.

The FTSE 100 had ben almost 2% down but was just 0.8% lower on the day just before 1pm.

The pound, however, was a cent and a half down versus the dollar to stand at $1.0578 and a cent lower against the euro.

The single European currency was also suffering against a resurgent US currency.

In addition to its bond-buying action, the Bank said it would postpone the start of its efforts to unwind the sale of bonds it acquired through financial crisis and COVID crisis era quantitative easing.

The Bank had planned to reduce its £838bn of gilt holdings by £80bn over the next year.

Neil Wilson, chief markets analyst at Markets.com, said the Bank’s move followed evidence of “severe liquidity stress”.

This would have been particularly evident for pension funds who have faced demands for additional cash to cover off rising yields.

“The question is whether (this Bank action) acts to stabilise longer-term or if the market retests the Bank’s resolve”, he wrote.

“We’re now seeing the Bank go toe-to-toe with the market and this might not lead to any decrease in volatility”, he warned.