The Bank of England has raised its key interest rate to 2.25 per cent from 1.75 per cent and says it will continue to "respond forcefully, as necessary" to inflation, despite the economy entering recession.
The BoE estimates Britain's economy will shrink 0.1 per cent in the third quarter - partly due to the extra public holiday for Queen Elizabeth's funeral - which, combined with a fall in output in the second quarter, meets the definition of a technical recession.
Economists polled by Reuters last week had forecast a repeat of August's half-point increase in rates, but financial markets had bet on a three-quarter-point rise, the biggest since 1989, barring a brief, failed attempt in 1992 to support sterling.
The BoE move follows the US Federal Reserve's decision on Wednesday to raise its key rate by three quarters of a percentage point, as central banks worldwide grapple with post-COVID labour shortages and the impact of Russia's invasion of Ukraine on energy prices.
"Should the outlook suggest more persistent inflationary pressures, including from stronger demand, the Committee will respond forcefully, as necessary," the BoE said, using a similar form of words to previous months for its policy intentions.
The BoE's Monetary Policy Committee voted 5-4 to raise rates to 2.25 per cent, with Deputy Governor Dave Ramsden and external MPC members Jonathan Haskel and Catherine Mann voting for an increase to 2.5 per cent, while new MPC member Swati Dhingra wanted a smaller rise to 2 per cent.
The MPC also voted unanimously to reduce the BoE's STG838 billion of government bond holdings by STG100 billion over the coming year, by allowing bonds to mature and through active sales, which will start next month. This is in line with the goal it stated in August.
The BoE now expects inflation to peak at just under 11 per cent in October, below the 13.3 per cent peak it forecast last month, before Liz Truss won the Conservative Party leadership and became Britain's prime minister with a promise to cap energy tariffs and cut taxes.
Inflation would remain above 10 per cent for a few months after October, before falling, the BoE said.