By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s FTSE 100 index ended lower for a fourth straight day on Wednesday, marking the longest losing streak in almost two months as supermarket operators and Unilever PLC added pressure on the benchmark.

The FTSE 100 index gave up 0.4% to 6,437.50, the lowest closing level in a month.

Tesco PLC (TSCDY) pared earlier steep losses and ended 0.3% lower after reporting a decline in first-half net profit, as it struggles to regain its footing in the U.K. and faces sales declines in international markets.

Another food retailer, J Sainsbury PLC gave up 1.3%, failing to get a boost from stronger sales numbers in the second quarter. The firm said it was the only major supermarket to expand its market share during the period, adding that its online grocery business grew over 15% during the quarter.

Unilever (UL) also added pressure in London, down 1.7%, after UBS cut the consumer-products firm to neutral from buy, citing slowing demands in emerging markets on top of currency weakness.

"Whilst this does not invalidate the long term structural EM growth story, perhaps the market needs to revisit the growth algorithm one should apply. With Unilever positioning itself as 'the' emerging market company it will unavoidably find itself in the middle of this debate," the analysts said.

Bucking the negative trend in London, shares of Barclays PLC added 1% after Société Générale lifted the bank to buy from hold, according to Dow Jones Newswires.

Mining firms were further on the rise, tracking most metals prices higher. Shares of Vedanta Resources PLC gained 1.4%, Anglo American PLC picked up 1.2%, BHP Billiton PLC (BHP) climbed 1.2% and Rio Tinto PLC (RIO) rose 1.1%.

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