Britain's top share index retreated on Wednesday, leaving it set for its biggest daily fall in two weeks after poorly received results sent mining and technology stocks lower, Reuters reported. FTSE 350 mining shares fell 2.7 percent, led lower by BHP Billiton, which dropped 3.4 percent after an earnings update. Although BHP beat its guidance for iron ore, it flagged a further hit to its full-year underlying profit of up to $650 million, chiefly linked to writedowns in its copper business. Britain's blue-chip FTSE 100 index was down 0.7 percent at 6,721.95 at 0842 GMT.
