FTSE 100 hits two-week low as energy stocks slide

London's FTSE 100 slipped to a two-week low on Tuesday, dragged down by heavyweight energy stocks as oil prices retreated, while British American Tobacco fell after issuing downbeat guidance.The blue-chip FTSE 100 index CURRENCYCOM:UK100 fell 0.5% to 10,636.71 points, its lowest since September 15…