Inflation has fallen to its lowest level in more than a year, official figures revealed as the Bank of England prepared to publish its latest quarterly outlook for the economy.
The sharper-than-expected drop in the Consumer Prices Index (CPI) rate from 2.7% in September to 2.2% in October was seen as easing pressure on the Bank to lift historically-low interest rates. Sterling fell on currency markets as a result.
The figure equals the level of inflation in September last year and takes it closer to reaching the Bank's target level of 2% for the first time in four years. It was last lower, at 1.9%, in November 2009.
Prime Minister David Cameron hailed the fall as "encouraging news for hard-working people" in a Twitter message, though Labour pointed out that wages - rising at an annual rate of just 0.7%, according to latest figures - were still lagging behind.
Savers are also still struggling to find accounts that beat the rise in the cost of living, according to price comparison website Moneyfacts.
Policymakers at the Bank of England's monetary policy committee (MPC) were shown the figures last week before making their latest decision to hold interest rates.
Lower inflation expectations will reduce the pressure on the Bank to cut interest rates although better prospects for the UK's gross domestic product (GDP) and unemployment will have the opposite effect.
The Bank has pledged not to raise interest rates before the jobless rate falls to 7% and indicated this target is unlikely to be met until the third quarter of 2016 at the earliest.
So the likelihood of this target being met sooner would add to anxiety that interest rates will be raised from their historic low of 0.5% before that time.
A safeguard built into the "forward guidance" policy means rates can be subject to a "knockout" if inflation looks likely to spiral out of control but this is looking less likely now that it is close to the Bank's 2% target.
Should tomorrow's report forecast inflation easing back further, it will be seen as a counterbalance to pressure from other economic indicators to raise interest rates.
Nida Ali, economic adviser to the EY ITEM Club, said: "Inflation is coming down much quicker than the Bank's expectations. In light of the latest developments, we are likely to see a big downgrade to inflation in tomorrow's report."
Key factors in the latest fall in CPI were a petrol pump price war that saw 4.9p cut from a litre of fuel during October, and a smaller impact from university tuition fees, a year after they were introduced.
Recently-announced energy price hikes of around 9% have yet to take effect and are likely to have an upward impact on inflation later this year.
The latest plunge in inflation comes after the UK recorded three successive quarters of improving GDP growth as it strives to recover from the economic downturn.
Martin Beck of Capital Economics said: "October's inflation data suggests that the UK economy is hitting a sweet spot of accelerating growth and falling inflation."