London - Britain's top share index was dragged lower on Wednesday by Unilever, hit after a broker downgrade, and by mining companies suffering from a slump in metal prices due to China's devaluation of the yuan.
China, the world's second-largest economy and the biggest consumer of metals, devalued its currency on Tuesday after a run of poor economic data, raising the costs of imports.
London nickel, copper and aluminium all dropped to six-year lows on Wednesday as fears intensified that China's weaker yuan would corrode demand.
The UK mining sector was down 2.9 percent in early deals after shedding 4.4 percent in the previous session.
Glencore declined the most, dropping 5.2 percent.