By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s FTSE 100 index closed at the highest level in six weeks on Monday, as investors welcomed the move by U.S. former Treasury Secretary Lawrence Summers to drop out of the race to become the next Federal Reserve chairman.

The benchmark index added 0.6% to 6,622.86, posting its highest close since early August.

The gain came as both the broader European markets and U.S. stocks moved higher on news that Summers withdrew from consideration to be the next Fed boss as he concluded that any possible confirmation process for would be "acrimonious."

Many analysts considered Summers, previously seen as the front runner for the post, as a relatively hawkish pick for the central bank's top post and as more skeptical toward quantitative easing than Janet Yellen, the Fed's vice chair. The move potentially paves the way for Yellen to head the Fed, and she is expected to scale back the central bank's quantitative-easing program less aggressively than Summers would have.

Banks benefited from the upbeat sentiment, with shares of Royal Bank of Scotland Group PLC (RBS) up 1.4% and Lloyds Banking Group PLC (LYG) 1% higher. Barclays PLC (BCS) gained 1.3% after Nomura lifted the bank to buy from reduce, according to Dow Jones Newswires.

Mining firms gained as most metals prices moved higher, supported by a weaker dollar. Shares of Antofagasta PLC rose 3.9%, BHP Billiton PLC (BHP) added 1.1% and Rio Tinto PLC (RIO) gained 1.3%.

Vedanta Resources PLC gained 2% after the miner appointed Tom Albanese as chairman of its subsidiary, Vedanta Resources Holdings Ltd. Albanese stepped down as Rio Tinto's chief executive earlier in the year.

But shares of miner Fresnillo PLC fell 13%. Max Cohen, financial sales trader at Spreadex, said in a note that the losses came as "investors weighed up the prospect of a big levy on the mining sector in Mexico."

"All of Fresnillo's seven operational mines are in Mexico, leaving it heavily exposed to such an increase in its tax burden," he added.

Shares of GlaxoSmithKline PLC (GSK) fell 0.5% after Barclays cut the drug maker to equal weight from overweight.

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