* Miners hurt by lower metals prices
* Energy stocks fall after BG results
* Compass top blue chip riser after update
By Tricia Wright
LONDON, Feb 5 (Reuters) - Britain's top share index fell 1.6 percent by midday on Friday, extending the previous session's hefty losses, hurt by commodity issues on fears over the global recovery picture, ahead of crucial U.S. non-farm payrolls data.
ICAP <IAP.L>, the world's biggest interdealer broker, topped the blue chip fallers list, sinking nearly 18 percent after the company said full-year earnings would miss analysts' expectations. [
]By 1205 GMT, the FTSE 100 <
> was off 82.53 points at 5,056.78, on track for its biggest weekly fall since October, after ending down 2.2 percent on Thursday.Energy stocks took the most points off the index, led lower by BG Group <BG.L>, off 4.6 percent, after its fourth-quarter earnings, excluding non operations, missed expectations.
Royal Dutch Shell <RDSa.L> and BP <BP.L>, which both posted disappointing Q4 results earlier this week, fell 1.8 and 1.6 percent respectively.
Investors were anxious ahead of the U.S. jobs data, scheduled for release at 1330 GMT, with a Reuters poll predicting a 5,000 increase in the number of jobs.
Miners were also under pressure, adding to the previous session's decline, on a renewed bout of risk aversion and falling metals prices.
Vedanta Resources <VED.L>, Xstrata <XTA.L> and Lonmin <LMI.L> were among the hardest hit, shedding 4.8 to 4.9 percent.
Global stock markets suffered this week on fears that troubles in Greece and other southern members of the euro zone, including Portugal and Spain, could impede or even derail an economic recovery that helped equities surge in 2009.
"I certainly subscribe to the view that the situations in Greece and Portugal are difficult, but I don't think it's the sole reason that the market is down," said Paul Kavanagh, partner at Killik & Co.
"My view is that it's another thing for somebody to start to feel nervous about, and it's just adding weight to the reasons why people want to take a profit and preserve the position a little bit."
Banks, which tend to suffer when investors become more risk averse, were in the doldrums, with Barclays <BARC.L>, HSBC <HSBA.L>, Lloyds Banking Group <LLOY.L>, Royal Bank of Scotland <RBS.L> and Standard Chartered <STAN.L> dropping 0.9 to 5.3 percent.
HANDFUL OF GAINERS
Compass <CPG.L> was the biggest FTSE 100 riser, adding 4.6 percent after the caterer said it made a good start to its current fiscal year, with its rate of sales decline slowing and its pipeline of new business remaining strong. [
]Liberty International <LII.L> was also in favour, putting on 0.9 percent, with the mall owner mulling a radical division of its portfolio into two separate listed companies as it battles to bounce back from the worst property crash in decades. [
]Vodafone <VOD.L> climbed 0.3 percent, building on an advance made on Thursday when the mobile phone operator posted third-quarter revenue ahead of forecasts and raised its outlook.
British manufacturers' raw material costs rose more than expected last month and at their sharpest annual rate since October 2008 as the cost of crude oil surged, official data showed. [
]