By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- Shares of Admiral Group PLC led U.K. stocks higher on Monday after a broker upgrade, while publisher Pearson PLC dropped after slashing earnings forecasts.

The FTSE 100 index gained 0.4% to close at 6,180.98, its highest closing level since May 2008.

Admiral Group jumped 4.9%, as Goldman Sachs lifted the car insurer to buy from neutral and added the firm its conviction-buy list.

"While we acknowledge that the U.K. motor cycle is softening and that Admiral's ancillary revenue is likely to decline, we believe there is potential for claims inflation to decline faster than the market expects," the Goldman Sachs analysts said in a note.

"On our analysis, as a result of renegotiated reinsurance terms, the group has significant gearing towards lower claims inflation," they added.

The analysts further reiterated their buy rating on Aviva PLC , helping push the shares 2.4% higher.

Shares of Unilever PLC added 0.5%. Investec Securities analyst Martin Deboo upgraded the food producer to buy from hold, citing the potential for margins to surprise to the upside in its full-year earnings report due on Wednesday.

"From a macro, strategic perspective, Investec is bullish on equities in 2013 and has resumed an overweight stance on staples. In our opinion, this all points in the direction of renewed enthusiasm for Unilever," he said in a note.

Shares of Pearson PLC slumped 2.9% after the publishing firm cut its earnings forecasts for 2012.

Drinks maker Diageo PLC (DEO) lost 1.3%, as UBS cut the stock to neutral from buy.

Shares of luxury-goods firm Burberry Group PLC (BURBY) tripped 1.4%, tracking losses for peer Compagnie Financiere Richemont SA , which posted disappointing quarterly sales.

Mining firms rose. Rio Tinto PLC (RIO) gained 1.5%, while BHP Billiton PLC (BHP) added 1.4%. Metals prices were mostly higher.

Glencore International PLC (GLCNF) picked up 1.4% and Xstrata PLC gained 1.5%, after South African utility firm Eskom withdrew its objections to the proposed merger of the two commodity firms, removing a hurdle in the multibillion-dollar deal.

Oil firms were also mostly higher with shares of Royal Dutch Shell PLC (RDSB) up 0.3% and BG Group PLC 0.5% higher. Oil prices were, however, lower.

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