THE Bank of England hinted on Wednesday that interest rates may need to rise in just over a year after it sharply revised up its forecasts for economic growth over the next three years.
It also announced an update to its "forward guidance" policy laying out the likely path for rate changes, saying it will focus on a range of measures of the spare capacity, or slack, in Britain's economy.
The Bank said interest rate increases in line with current market expectations seemed consistent with keeping inflation close to its 2pc target. It added that markets priced in a first rate rise in the second quarter of 2015.
It stressed that any interest rate rises would be gradual, and that the ultimate level of British interest rates was likely to end up well below the 5 percent average before the financial crisis.
The Bank's governor, Mark Carney, defended the BoE's decision to adopt a forward guidance plan last year, even though the first version was quickly overtaken by a fast fall in the unemployment rate to which the pledge of low rates was linked.
"Forward guidance is working," Carney told a news conference. "Expected interest rates have remained low even as the economy has recovered strongly, uncertainty about interest rates has fallen, and most importantly, UK businesses have understood the message."
Sterling hit a two-week high against the dollar and British government bond prices fell after the Bank's announcement.
The Bank was forced into making a new statement on when and how it intends to raise interest rates by the unexpectedly sharp fall in unemployment since Carney made his first stab at forward guidance in August.
Shortly after arriving from his native Canada, Carney persuaded the other eight Bank policymakers to make an unprecedented pledge to keep rates on hold until unemployment fell to 7pc. The Bank said that would take three years.
Barely six months later, unemployment stands at 7.1pc, and the Bank forecasts it hit 7pc in the three months to January and will sink further to 6.5pc by early next year.
Carney said the Bank would now monitor a broad range of indicators including unemployment, business surveys and the number of hours worked as it weighs up the need for an increase in interest rates.
Britain's economy has grown at an annualised rate of 3pc since August. But output is still 2pc below its 2008 peak, unlike many other advanced economies, which have more than made up the damage caused by the financial crisis.
The Bank revised up its growth forecast for 2014 to 3.4pc from 2.8pc, a more bullish forecast than most other economists, and one which the Bank said was due in part to its belief that the Office for National Statistics had underestimated fourth-quarter gross domestic product growth.
The Bank says room remains for more growth without stoking inflation, despite a record number of people in work and business surveys that show bottlenecks in factories.
Inflation has fallen unexpectedly rapidly to its 2pc target and the Bank said it expected it to dip further to 1.7pc by March, before hovering close to 2pc for the next couple of years.
However, the Bank said it was now more pessimistic on the outlook for British productivity than three months ago, as it had failed to keep up with rises in output.
Wednesday's statement of guidance closely follows previous Bank statements of the outlook for monetary policy, and does not tie policy to a specific range of economic indicators as some analysts had expected.
Two weeks ago, after the latest fall in the unemployment rate, Carney stressed the economic recovery had some way to run before it would be time to start raising rates from their current 0.5pc. He also said any rise would be gradual.
Sterling hit a five-year high on a trade-weighted basis last month - something the Bank fears could impede British exports - in part because of expectations that Britain will raise interest rates before the United States or the euro zone.
New Federal Reserve Chair Janet Yellen said on Tuesday that the she intended to reduce the stimulus that the U.S. central bank is pumping into the U.S. economy, but the recovery in the country's labour market was far from complete.
Economists polled by Reuters last month did not expect the Bank to raise rates until the second quarter of 2015.