The FTSE 100 Index dropped 10 points or 0.09 percent on Tuesday to close at 10812 points. Losses were led by Computacenter (-5.09%), Smith & Nephew (-4.56%) and GlaxoSmithKline (-2.48%). Offsetting the fall, top gainers were Antofagasta (4.69%), Glencore (4.05%) and Weir (3.52%).