Rate tops level last seen after Liz Truss mini-budget as fears of global inflation and US political instability spook markets

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Britain’s long-term cost of borrowing has hit its highest level since 1998, as political instability in the US and fears of sustained high levels of inflation triggered a sell-off in global bond markets.

The yield, or interest rate, on 30-year UK government bonds hit 5.115% early on Wednesday, according to the financial data provider Refinitiv.