Britain's top share index edged off a four-month high on Monday, lagging most of its continental peers as sharp falls in copper and oil prices hit heavyweight mining and energy stocks, Reuters reported. Oil explorer Tullow Oil and miners Anglo American and BHP Billiton were the top fallers on the FTSE, all down around 3 percent. Shares in energy and basic materials companies knocked a combined 29 points off the FTSE, which was down 25.47 points, or 0.4 percent, at 6,807.36 points at 1112 GMT. The index recorded its biggest weekly rise in three years last week, mirroring broad gains across Europe as the European Central Bank unveiled a bond-buying programme to stimulate the euro zone economy. The UK index is up 4 percent so far this year, or roughly half as much as the euro zone Euro STOXX 50 index.