By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s benchmark stock index climbed for a third straight day on Monday, with Aggreko PLC rallying after a well-received earnings report and drug makers on the rise.

The FTSE 100 index rose 0.1% to 6,725.82, closing at the highest level since late May.

Among notable movers in the index, Aggreko climbed 6% after the provider of temporary-power solutions said it expects full-year pretax profit to be in line with the market's expectations. It also reported third-quarter revenues and margins slightly ahead of the same period last year.

Drug makers also helped to lift the index. Shares of GlaxoSmithKline PLC (GSK) rose 1.3% and AstraZeneca PLC (AZN) picked up 1.6%.

Shares of Randgold Resources Ltd. gained 4.6% after the gold miner said it plans to "aggressively" explore opportunities in the Ivory Coast.

Other mining firms were mostly lower, as metals prices were mixed. Antofagasta PLC dropped 0.6% and Rio Tinto PLC (RIO) lost 0.9%.

Tullow Oil PLC fell 2.2% after the oil explorer said it has temporarily suspended all operations at two areas in Kenya due to labor unrest.

Shares of InterContinental Hotels Group PLC dropped 2.3% after the hotel operator posted a weaker-than-expected third-quarter trading update.

Lloyds Banking Group PLC (LYG) gave up 0.9% after Investec Securities cut the firm to hold from buy ahead of the bank's third-quarter results on Tuesday.

Some other banks were also on the decline in London, with shares of Barclays PLC (BCS) down 1.7%.

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