LONDON - The Bank of England raised interest rates by a further quarter of a percentage point on Thursday and said it expected the surge in British inflation to cool faster than before, despite a surprise jump in price growth last month.

Sounding more upbeat about the outlook for the country's slow economy, the BoE's nine rate-setters voted 7-2 in favor of a 25 basis-point increase in Bank Rate to 4.25%, as expected in a Reuters poll of economists.

That was its 11th consecutive increase in borrowing costs, beginning in December 2021, although it was the smallest rise since June.

Monetary Policy Committee members Swati Dhingra and Silvana Tenreyro voted to keep rates on hold while Catherine Mann, who has been the MPC's strongest advocate for increasing rates in bigger steps, backed the relatively small 25 basis-point rise.

The BoE - which is trying to reconcile a weak economic outlook and anxieties about global banks with stubbornly high inflation - kept unchanged its message that the MPC saw less urgency about maintaining its fast run of rate hikes.

"The MPC will continue to monitor closely indications of persistent inflationary pressures, including the tightness of labor market conditions and the behavior of wage growth and services inflation," the BoE said.

"If there were to be evidence of more persistent pressures, then further tightening of monetary policy would be required."

BoE Governor Andrew Bailey and his colleagues last month dropped language saying that they were ready to act forcefully if the outlook suggested persistent inflationary pressures.

Sterling firmed against the U.S. dollar and the euro while British government bond prices were little changed after the announcement. Investors in rate futures markets positioned themselves for one more 25 basis-point move by the BoE, putting a roughly 50% chance on a quarter-point increase as soon as May.

Finance minister Jeremy Hunt said he supported Thursday's rate hike as part of Britain's battle against high inflation.

Karen Ward, chief market strategist EMEA at J.P. Morgan Asset Management, said the prospect of persistent inflation was a bigger worry in Britain than elsewhere, adding that the BoE should refrain from offering guidance about future policy.

"Over the past year they have frequently signaled a view that they expect interest rates to peak at current levels but then the inflation data has proved otherwise," Ward said.

"They should leave themselves degrees of freedom by merely stating they will do whatever it takes to bring inflation down."

In Thursday's statement, the BoE said price growth remained on course to fall sharply in April-June, despite a surprise jump in inflation to 10.4% in February.

Inflation in the second quarter would be lower than the BoE forecast last month, after Hunt last week announced an extension of state subsidies to lower households' utility bills and international energy prices fell, it said.

As recently as Tuesday - before the February inflation data - investors were split 50-50 on whether the BoE would leave Bank Rate unchanged for the first time since November 2021 after the rescue of Credit Suisse and the collapse of Silicon Valley Bank.

The BoE on Thursday noted "large and volatile moves" in financial markets around the world but said its Financial Policy Committee judged that Britain's banking system remained resilient.

"The MPC will continue to monitor closely any effect on the credit conditions faced by households and businesses, and hence the impact on the macroeconomic and inflation outlook," it said.

The European Central Bank last week stuck to its plans and raised rates by 50 basis points despite the banking sector turmoil, a move repeated by the Swiss National Bank on Thursday as it warned that more hikes could not be ruled out.

On Wednesday, the U.S. Federal Reserve raised its main interest rates by a quarter of a percentage point, and indicated it was on the verge of pausing further increases.

The BoE predicted measures included in Hunt's budget would speed up Britain's sluggish economy and increase the level of gross domestic product by about 0.3% over the coming years.

It predicted GDP would grow slightly in the second quarter of 2023, an upgrade of its pre-budget forecasts made in February that the economy was on course to shrink by 0.4% during the April-June period.

As well as the extended energy subsidies to households - which had originally been due to expire in April - the BoE now expects stronger employment growth than previously forecast.

The BoE is worried about the strength of the labor market because pay growth, despite cooling a bit recently, is running far above its historical average and shortages of workers remain acute, all of which is inflationary.

However, it said it expected wages to rise slightly less than it had previously forecast, as inflation expectations fell.

The BoE was not due to hold a quarterly news conference by Bailey and other top officials on Thursday. Bailey is due to make a speech on Monday.

(Additional reporting by Andy BruceWriting by William SchombergEditing by Catherine Evans)