By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Most U.K. stocks advanced on Friday after data showed a surprise improvement in the construction sector and as better-than-expected growth figures from the euro zone sparked wider optimism across European financial markets.

The FTSE 100 index added 0.1% to close at 6,663.62, ending the week 1.4% higher.

Mining firms posted some of the biggest advances, tracking most metals prices higher. Precious-metals miners posted solid advances as gold and silver futures rose around 1.3% and 4% respectively. Shares of Fresnillo PLC picked up 5.3% and Randgold Resources Ltd. added 1.9%.

Among bigger mining firms, shares of BHP Billiton PLC (BHP) gained 0.9% and Glencore Xstrata PLC rose 1.8%.

The wider stock market copied positive moves on other European bourses. The upbeat sentiment was spurred by better-than-expected economic-growth data for the euro-zone, showing the four major economies are now out of recession.

On the data front in the U.K., the Office for National Statistics said the construction sector grew by 0.2% in the fourth quarter of last year. A preliminary estimate for output in the sector published in January had shown a 0.3% contraction for the construction industry.

"With confidence in the economic recovery building, interest rates still low and house prices booming, 2014 should be another strong year for builders. Though the first quarter may well see sizeable disruption from the weather, output will bounce back in when the weather improves as builders make up for lost time," said Rob Wood, chief U. economist at Berenberg, in a note.

Several home builders rose after the data. Shares of Taylor Wimpey PLC advanced 0.7%, Berkeley Group Holdings PLC added 0.5% and Barratt Developments PLC put on 0.6%.

On a more downbeat note, shares of Wm. Morrison Supermarkets PLC dropped 1% after Exane BNP Paribas cut the food retailer to underperform from neutral.

"Morrison is hemorrhaging market share and has a pricing problem requiring painful margin cuts to fix," the analysts said.

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