Britain's economy shrank more than expected at the end of 2012 with a slump in North Sea oil production, lower factory output and a hangover from the London Olympics pushing it perilously close to a "triple-dip" recession.
Britain's gross domestic product fell 0.3 percent in the fourth quarter, the Office for National Statistics said on Friday, a sharper fall than the 0.1 percent decline seen by analysts.
The news is a blow for Britain's Conservative-led government, which only a day earlier defended its austerity program against criticism from the International Monetary Fund and needs solid growth to ensure it meets budget targets and keeps its triple-A debt rating.
Sterling fell to its lowest in 13-1/2 months against the euro and hit a five-month low against the dollar in response while British government bonds reversed losses.
The euro was also buoyed by a stronger-than-expected German Ifo sentiment survey.
"This is a very disappointing outturn," said Philip Shaw, economist at Investec in London. "Clearly now the talk will focus on whether we are in a triple dip recession. Certainly the news is unwanted."
Britain's economy is now 3.3 percent smaller than its peak in Q1 2008, having recovered only about half the output lost during the financial crisis -- a worse performance than most other major economies.
The country slipped back into recession in the last three months of 2011, and only emerged from it in the third quarter of 2012, after a boost from the London Olympics.
After a bout of inclement snowy weather in January -- which is likely to have hit spending and output -- the risk is that the economy will continue to shrink in the first three months of this year, technically pushing it into a rare and unwelcome "triple dip" recession.
Britain's biggest department store group, John Lewis , said earlier on Friday that snow was responsible for its sales growth stalling in the latest week.
In economic terms, the picture remains an unchanged one of stagnation over the past year. But politically, the latest dip in national output is more incendiary.
Finance minister George Osborne stuck fast to his austerity plan on Thursday, rejecting suggestions the International Monetary Fund's chief economist that he should consider slowing his deficit reduction plan.
Prime Minister David Cameron this week staked his political future on offering a referendum on Britain's place in the European Union. But it is Osborne's gamble that austerity will deliver strong growth before a 2015 election that will be crucial in determining his Conservative party's chance of winning.
After the figures were released, the Treasury conceded that Britain still faced a "very difficult economic situation".
"While the economy is healing, it is still a difficult road," it said in a statement.
Britain's chief central banker Mervyn King expects no more than a "gentle recovery" this year, while this week the IMF cut its 2013 forecast for British economic growth to 1.0 percent from 1.1 percent predicted in October.
However economists and business groups warn that even such lackluster growth could be derailed by a hit to firms' and consumers' confidence from talk of a triple-dip recession.
That prospect will also add to pressure on the ruling coalition of Conservatives and Liberal Democrats to loosen its deficit-cutting drive and bolster the economy as finance minister George Osborne prepares his 2013 budget, due in March.
The biggest driver for the fourth-quarter fall in GDP was a 10.2 percent drop in mining and quarrying output, the biggest since records began in 1997, driven by disruption from extended maintenance affecting North Sea oil and gas fields.
This knocked 0.18 percent off GDP, while slightly smaller amounts of damage were done by falls in factory output and in the 'government and other services' category, where the Olympics had boosted sports and recreation services in the third quarter.
Friday's figures showed that output in Britain's service sector - which makes up more than three quarters of GDP - was flat in the fourth quarter after rising 1.2 percent in the third. Industrial output was 1.8 percent lower, while construction - which accounts for less than 7 percent of GDP - grew by 0.3 percent.
(Reporting by David Milliken and Olesya Dmitracova, writing by Mike Peacock)