By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s FTSE 100 index advanced on Monday as heavyweight oil firms climbed, partly offsetting worries about the debt impasse in the U.S. But banks added pressure on the political worries and after a downbeat broker note on the sector.

The benchmark index rose 0.3% to close at 6,507.65, ending higher for a third straight trading day.

Oil firms helped lift the London index as oil prices moved higher. Shares of Royal Dutch Shell PLC (RDSB) added 0.5%, BP PLC (BP) gained 0.9% and BG Group PLC rose 1.3%.

The gains came as the continued political stalemate in the U.S. dented investing optimism globally. Senate leaders over the weekend tried to broker a deal to reopen government -- now on shutdown Day 14 -- and to avoid bumping up against the debt ceiling on Oct. 17, but appeared to struggle to break the deadlock.

Heavyweight Vodafone Group PLC (VOD) gained 0.8% after the telecom firm said it completed the takeover of Kabel Deutschland Holding AG .

Banks were among decliners, with shares of Royal Bank of Scotland Group PLC (RBS) off 1.4%, Lloyds Banking Group PLC (LYG) down 0.5% and Barclays PLC (BCS) 0.4% lower.

Analysts at Bank of America Merrill Lynch on Monday said they are now less positive on U.K. banks, owing to share price performance, the fact that margins look set to peak during the first half of next year and concerns in the pipeline over capital demands from the U.K. banking supervisor. Merrill cut Royal Bank of Scotland to underperform and removed Lloyds from its Europe 1 list.

Among other fallers, shares of Diageo PLC (DEO) gave up 1% after Investec Securities analyst Martin Deboo cut the spirits maker to sell from hold.

"This reflects concern on top-line progress relative to guidance, risks from [emerging markets] following Unilever's warning, and what we think is a still-subdued recovery in the USA," he said.

In the same vein, Croda International PLC recovered from an earlier drop of close to 3%, to gain 1.3%. J.P. Morgan Cazenove cut the specialty-chemicals firm to neutral from overweight, as "a combination of negative currencies and over-optimistic consensus could lead to disappointment in the short run."

Johnson Matthey PLC climbed 5.9% after J.P. Morgan Cazenove lifted the chemicals firm to overweight from neutral. The analysts said they "expect years of investment in the industrial-catalyst market to lead to accelerated growth, benefiting from the swathe of new-customer capex, driven by Chinese petrochemical self-sustainability and the U.S. shale gas revolution."

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