By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K. stocks extended losses on Monday after National Grid PLC declined on the back of a broker downgrade and mining firms dropped as metals prices moved south.

The FTSE 100 index slid 0.6% to 6,559.02, adding to a 0.4% loss from Friday.

Among notable losers, National Grid PLC dropped 1.7% after UBS cut the utility firm to neutral from buy, with the analysts saying it is difficult to identify further drivers to push the stock higher from current levels.

"We believe National Grid's U.S. turnaround is largely confirmed, and see no reason to doubt company guidance for 1-3% U.K. [return on equity] outperformance," the analysts said.

"We also believe National Grid can deliver its real dividend growth policy, although the company no longer stands out in terms of yield. National Grid deserves its premium valuation, in our opinion, although its attractions are now priced in, in our view," they added.

Another energy company, Centrica PLC , was also on the decline, off 1.6%, after saying it has decided not to proceed with its new-build gas storage project at Baird in the U.K.'s North Sea and to put its project at Caythorpe in East Yorkshire on hold indefinitely.

As a sector, mining firms weighed on the London benchmark as metals prices dropped across the board. Shares of Randgold Resources Ltd. gave up 1.6%, Anglo American PLC erased 1.3%, and Glencore Xstrata PLC (GLCNF) fell 0.6%.

Oil prices also moved lower, adding pressure on the U.K.-listed oil firms. Shares of Tullow Oil PLC lost 2.1%, Royal Dutch Shell PLC (RDSB) gave up 0.8% and BP PLC (BP) slipped 0.6%.

Banks were on the decline with Barclays PLC (BCS) off 2.6%, Lloyds Banking Group PLC (LYG) down 1.9% and Standard Chartered PLC 1% lower.

On a more upbeat note, shares of Croda International PLC added 1.8% after Credit Suisse lifted the chemicals firm to outperform from neutral.

Shares of Aberdeen Asset Management PLC gained 0.4% after the investment firm said underlying pretax profit for the full year is expected to come in toward the upper end of market forecasts.

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