By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- The U.K.'s benchmark index drifted lower on Wednesday, as mining firms dropped after disappointing trade data from China.

The FTSE 100 index lost 0.3% to 6,483.14, after closing at the highest level since June 4 on Tuesday.

Mining firms posted some of the biggest losses in the index after the release of disappointing trade data from China. Exports unexpectedly fell 3.1% in June from a year earlier, marking the first year-over-year drop for exports since January 2012. Imports decreased 0.7%, below a Reuters estimate of an 8% rise.

Miners tend to be sensitive to growth indications from China, as the country is a major user of natural resources. Metals prices were, however, mostly higher.

Shares of Rio Tinto PLC (RIO) lost 1%, Anglo American PLC fell 1.3% and BHP Billiton PLC (BHP) dropped 0.9%. Glencore Xstrata PLC shaved off 2.1% after UBS removed the commodity titan from its Europe key call list.

Banks were also lower, even as Moody's Investors Service lifted the outlook on the U.K. banking sector to stable from negative to reflect the "increasingly stable economic outlook despite its low growth prospects."

"Although the U.K. continues to face the prospect of low medium-term economic growth, Moody's does not expect a deterioration in the operating environment. Moreover, unemployment has not increased as much as in previous recessions, thereby contributing to a stabilization in banks' asset quality," the ratings agency said.

Shares of Royal Bank of Scotland Group PLC (RBS) fell 1.3%, HSBC Holdings PLC (HBC) dropped 0.5% and Lloyds Banking Group PLC (LYG) slipped 0.3%.

On a more upbeat note in London, oil firms showed positive trends as oil prices moved above $105 a barrel for the first time since May 2012. BG Group PLC rose 0.6%, BP PLC (BP) added 0.9% and Royal Dutch Shell PLC (RDSB) inched 0.4% higher.

Burberry Group PLC shares (BURBY) also bucked the negative trend in London, rising 4.4% after the company's fiscal first-quarter trading update. The luxury-goods firm said same-store sales rose 13%, driven by "exceptional" performance of its spring/summer 2013 fashion line.

Shares of Tesco PLC (TSCDY) gained 1.1% after Exane BNP Paribas lifted the supermarket retailer to outperform from neutral.

Exane also lifted Wm. Morrison Supermarkets PLC to neutral from underperform, helping send the shares 1.2% higher.

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