By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K. stocks headed for their biggest monthly loss since June on Friday, tracking a wider selloff in Europe, where lower-than-expected euro-zone inflation data spurred fears of deflation.

The FTSE 100 index slid 1.3% to 6,452.39, setting it on track for a 3.2% weekly fall and a 4.4% monthly decline.

Among top losers, shares of Diageo PLC (DEO) lost 2.6% after Goldman Sachs removed the drinks maker from its pan-European conviction buy list and cut its rating to neutral . The move comes after the owner of brands such as Guinness beer and Smirnoff vodka on Thursday flagged volatile demand in emerging markets, with sales in the Asia-Pacific region dropping 10%.

"We expect the softer performance in [the first half the year] to continue into 2H and see potential for continued EM challenges in [full-year 2015]," the Goldman Sachs analysts said in a note.

"Furthermore, there are no meaningful signs of a [developed markets] recovery for Diageo, and with competitive intensity picking up in U.S. vodka, we see a risk that DM growth deteriorates from here," they added.

BAE Systems PLC (BAESY) skidded 2.2% after Barclays downgraded the aerospace and defense firm to underweight from equal weight.

More broadly in London, the benchmark index extended losses after data showed euro-zone inflation fell to 0.7% in January from 0.8% in December, missing economists' expectations. The data reignited fears the region is heading for a period of falling consumer prices, known as deflation, which could derail the economic recovery.

As a sector, banks added the most pressure. Shares of Barclays PLC (BCS) lost 2.2%, Royal Bank of Scotland Group PLC (RBS) dropped 2% and heavyweight HSBC Holdings PLC (HSBC) gave up 1.4%.

On a more upbeat note in London, shares of BT Group PLC (BT) added 2.4%, after the telecoms company raised its full-year outlook, as it reported better-than-expected revenue for the third quarter.

Tobacco firms were also on the rise after upbeat comments from Goldman Sachs. The analysts said both British American Tobacco PLC (BTI), up 0.8%, and Imperial Tobacco Group PLC , rising 2.1%, currently trade on significant price-earnings discounts. The bank upgraded Imperial Tobacco to buy from neutral and added it to the conviction buy list, while reiterating a buy rating on BAT.

More must-reads from MarketWatch:

European losses deepen after weak inflation data

How to invest if Europe flirts with deflation

China e-investing sparks 'rate war' with banks

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