By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- U.K. stocks advanced Monday, with energy shares including Tullow Oil PLC pushing the benchmark FTSE 100 higher in the first day of February trade.

The U.K.'s FTSE 100 rose 0.5% to 6,782.55. The index last week finished January with a 2.8% advance, the best monthly gain since February 2014.

On Monday, shares of Tullow Oil PLC shined as they shot up 9.3% following speculation British oil major Royal Dutch Shell PLC (RDSB) is interested in purchasing Tullow. Tullow shares rose 4% on Friday. Royal Dutch Shell shares closed Monday's session up by 2.9%.

Other energy-related stocks notched gains, catching up with an 8% surge in Brent crude-oil and U.S. oil futures (CLH5) on Friday, which came after European trading closed. Oil prices seesawed on Monday, but oil producer BG Group PLC shares sprang up 5.3% and energy- and industrial-engineering services firm Weir Group PLC tacked on 3.2%.

BP PLC shares rose 3%. The British oil major -- whose financial results are due Tuesday -- is expected to cut capital spending by more than 10%, according to a report in The Guardian newspaper.

CRH PLC was the second-best performer on the FTSE 100, climbing 7.2% after confirmation the building-materials company is in talks to purchase about 6.5 billion euros ($7.34 billion) in cement factories and other assets from France's Holcim AG and Lafarge SA . Holcim and Lafarge are working on completing a $40 billion merger.

But decliners included airline EasyJet PLC , with shares down 6.4% as rival carrier Ryanair PLC was cautious about its outlook for fiscal year 2016.

Kingfisher PLC also closed lower by 2.3% after Jefferies cut its rating on the home-improvement retailer to hold from buy. Jefferies said risks including currency headwinds balance out Kingfisher's "fundamental attractions" such as exposure to strengthening disposable income for U.K. consumers.

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