The Bank of England boosted its forecast for British growth in 2017 and some rate-setters were more nervous about rising inflation, but the Bank overall seemed in no rush to raise interest rates as the economy adjusts to the prospect of Brexit.

In a sign of a developing split, the BoE said some of its rate-setters had "moved a little closer" to their limits for tolerating an overshoot of the Bank's 2 per cent inflation target, caused by sterling's slide since June's Brexit vote.

But the BoE, announcing its latest quarterly thinking on Britain's economy on Thursday, sent broader signals that it was comfortable with its record low interest rates.

It said it now expected inflation would be slightly lower in two years' time than it did in November, a key yard-stick.

BoE governor Mark Carney said Thursday that central bankers are no longer able to prop up their economies through asset purchases an smaller interest rate hikes.

"In many respects, we're coming to the last seconds of central bankers' 15 minutes of fame, to use the Warhol line, which is a good thing," Carney said.

"It's a more balanced policy mix. Also structural policy is becoming more important, trade policy clearly important here and elsewhere."

Significantly, the BoE also said its rate setters now believed the unemployment rate could fall to 4.5 per cent - down from its previous estimate of 5 per cent and below the current rate - before it starts to push up inflation.

That could give the Bank more margin to keep rates at their record low for longer and may be useful as it announced the second big increase in three months to its forecast for economic growth in 2017.

Sterling initially rose on the announcement by the Monetary Policy Committee but quickly fell back and British government bond prices rose, suggesting investors were pushing back their bets on when the BoE might raise rates.

"On the whole the Committee doesn't appear to be poised at all to change the stance of policy," Philip Shaw, an economist with Investec, a bank, said.

BoE Governor Mark Carney and his fellow policymakers were wrong-footed by the resilience of Britain's economy last year following the referendum decision in June to take the country out of the European Union.

Britain's growth in 2016 was stronger than in any other Group of Seven big rich economy, confounding the BoE's pre-referendum warnings of a quick Brexit hit to the economy.

The BoE said on Thursday it now expected economic growth of 2.0 per cent this year, higher than economists had predicted and up a lot from its previous forecast of 1.4 per cent.

The new 2017 outlook towered above the forecast of 0.8 per cent growth made by Bank in the weeks after the Brexit vote, when the economy seemed to be heading for a recession and the BoE cut interest rates to a record low of 0.25 per cent.

Since then, Britain's consumers have carried on spending and finance minister Philip Hammond has relaxed the country's austerity drive.

Growth forecasts for 2018 and 2019 were raised by a moderate 0.1 per centage points in each year, and the Bank said it still expected rising inflation to cause household living standards to start stagnating at the end of this year.

The outlook for Britain's economy remains highly uncertain for political reasons too, related to Brexit and U.S. trade.

Carney was due to give a news conference to explain the Bank's latest Inflation Report at 7:30 a.m. ET.

RATES ON HOLD, NO NEW QE

The BoE said on Thursday its policymakers had voted 9-0 to keep rates on hold at 0.25 per cent, in line with economists' expectations in a Reuters poll.

The Monetary Policy Committee also decided unanimously to let its latest, 60 billion-pound phase of British government bond purchases close on schedule later this month. It made no change to its smaller corporate bond buying programme.

The BoE to stuck to its announcement in November that it its next policy move could be a rate hike or a cut, reflecting the uncertain outlook for the economy.

Before Thursday's announcement, financial markets had been pricing in a roughly 50-50 chance of a rate hike by the BoE this year. But most economists said it would probably not happen until mid-2019, when Britain is likely to have left the EU.

Until last year's Brexit vote, the BoE had been expected to follow the Fed closely with rate increases of its own.

The Bank reiterated its view that there were limits to how much it would tolerate inflation shooting temporarily above its 2 per cent target.

It has said it will keep rates at their record low in order to reduce the risk of choking off the economy's momentum.

But some MPC members appeared to be getting more anxious about the building inflation pressures.

"For some members, the risks around the trade-off embodied in the central projection meant they had move a little closer to those limits," the Bank said in a sum-up of the most recent debate amongst its policymakers.

The BoE now expects inflation to peak at 2.75 per cent in mid-2018 although many economists say it will exceed 3 per cent.