By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K.'s FTSE 100 index rose for a third straight day on Wednesday, with oil firms tracking oil prices higher and Diageo PLC climbing after a well-received earnings report.

The benchmark rose 0.8% to close at 6,621.06, building on a 0.2% gain from Tuesday.

Drinks maker Diageo PLC (DEO) climbed 3.2% after reporting a rise in full-year profit and revenue, although it warned of some weakness in emerging markets and continued trouble in western Europe.

Brewer SABMiller PLC , which makes Miller Lite and Peroni, put on 2.6%.

Oil firms further helped lift the index in London as oil prices moved higher. Shares of BP PLC (BP) put on 0.7%, Royal Dutch Shell PLC (RDSB) added 1%, and BG Group PLC rose 1%.

Among other resource firms, miner Antofagasta PLC gained 0.8%, after reporting an 8.4% increase in copper production in the first half of the year.

Shares of British American Tobacco PLC (BTI) put on 1.3% after the firm posted a rise in half-year profit and said it is confident of a year with good earnings growth.

Shares of Centrica PLC rose 1.4% after the gas utility raised dividends 6% and said it remains on track to deliver earnings growth in line with expectations for the full year.

Shares of GKN PLC inched 0.5% higher after J.P. Morgan Cazenove lifted the engineering group to overweight from neutral. The analysts pointed to the company's better-than-expected first-half results. GKN rallied 6.5% on Tuesday, after reporting a 12% rise in sales.

In the same vein, shares of ITV PLC gained 1% after Deutsche Bank upgraded the TV broadcaster to hold from sell.

On a more downbeat note, shares of Barclays PLC (BCS) shaved off 1.2%, adding to a 5.7% loss from Tuesday, when the bank announced plans to issue 5.8 billion pounds ($8.8 billion) in new shares to address a capital shortfall.

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