A global bond sell-off has seen UK gilt yields hit 6% for the first time in nearly 30 years, heaping pressure on the Chancellor ahead of his inaugural Budget later this month.

The yield on UK Government bonds, also known as gilts, reached 6.07% in morning trading on Thursday โ€“ the highest level since 1998, with the worldwide bond market woes spilling over into equities as Londonโ€™s FTSE 100 Index tumbled by 2%.

Gilt yields move counter to the value of the bonds, meaning their prices fall when yields rise.

Rising yields on these bonds mean it costs more for governments to borrow from financial markets.

It intensifies the challenge facing Chancellor John Healey as he looks to set out his first Budget at a time of pressure on Britainโ€™s creaking public finances and rising debt pile.

Axel Rudolph, chief technical analyst at IG, said: โ€œHigher yields mean the Government has to pay more to finance its debt, putting further pressure on the public finances and making it harder to balance spending commitments with the need to keep borrowing under control.

โ€œEven the recent fall in oil prices hasnโ€™t provided any lasting relief for bond markets.

โ€œWith yields still rising, the Chancellor faces an increasingly narrow path as he prepares to set out his plans for the economy.โ€

The FTSE 100 Index shed 209 points to stand at 10397.1 just over an hour after market opening.

Markets were also tumbling across Europe, with the Dax in Germany and Franceโ€™s Cac 40 both off 1.3%.

This came despite Brent crude prices falling back below 100 US dollars a barrel, down 2% at 99.9 dollars, on signs that Middle East crude flows are back to pre-Iran war levels.

Neil Wilson, Saxo UK investor strategist, said the โ€œrelentless rout in the bond market is sending investors running for coverโ€.

Government bonds were also slumping across the globe, with the US 10 year bond yield at its highest since 2002.

Susannah Streeter, chief investment strategist at Wealth Club, said: โ€œThe blue-chip index has taken a dive in early trade, with confidence hit by concerns about the potential for higher inflation, more refinancing costs and the knock-on effect on spending.

She added: โ€œWith debt already high and interest payments eating up a hefty chunk of public finances, sustained yields at these levels could further squeeze the Chancellorโ€™s wiggle room when he sets out his spending plans.โ€

Reform UK leader Nigel Farage said Andy Burnham โ€œis not facing up to the reality that he canโ€™t solve this crisisโ€, and the partyโ€™s economic spokesman Robert Jenrick suggested the Prime Minister would fail to curb borrowing costs with โ€œunfunded promises on a National Care Service, a ballooning benefits bill and more delays for Heathrowโ€.