The FTSE 100 closed down 20.97 points at 6,729.79. The biggest climber of the day was Friends Life, climbing by 5.90%. The biggest faller of the day was Petrofac, falling a massive 26.45%.
Petrofac released a profits warning, that partly blamed plunging oil prices. World oil prices have fallen 30% since June, due to plentiful crude supplies, the stronger dollar, and growing doubts over global demand and economic growth.