10:49am Wednesday 2nd January 2013
© Press Association 2013
Relief over America's deal to avert a budget crisis has sent London's FTSE 100 Index smashing through the 6000 barrier for the first time since July 2011.
The top tier rallied 1.8% higher - up 109.3 points to 6007.1 - after politicians passed short-term measures to prevent the United States careering over the so-called fiscal cliff.
Markets across Europe also powered ahead, with Germany's Dax up 2% and the Cac 40 in France rising by more than 1.4%.
The fiscal cliff agreement, which was sealed just hours before world markets were due to return from the New Year holiday, has staved off a devastating package of spending cuts and tax rises.
Economists feared that without action by Congress, the tax increases and spending cuts that technically took effect on New Year's Day would cause unemployment to surge and send the US economy back into recession.
UK blue chips were also boosted by economic cheer after a closely-watched survey revealed a return to growth in Britain's manufacturing sector and the highest reading for 15 months.
In an unprecedented pre-dawn vote in the House of Representatives, the deal avoided middle-class tax increases and delayed spending cuts for two months while raising tax rates on incomes over 400,000 US dollars (£247,000) for individuals and 450,000 US dollars (£278,000) for couples.
The Bill's passage on a 257-167 vote was a triumph for President Barack Obama after his re-election in November on the back of a pledge to impose higher taxes on the wealthy.
He said the measures were "just one step in the broader effort to strengthen the economy".
The London market has been in limbo in recent sessions as traders pondered the implications of America failing to reach a compromise to avoid the fiscal cliff. But experts feared the market elation would be short-lived, with America still to agree a long-term package of measures.
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