FTSE slips on oil after Dow dives

London's blue-chip index is more than 12 points, or 0.3%, down at 4,174. Overnight in New York, the Dow dropped a huge 161.27 points, or 1.94%, to 8,163.6. Tullow Oil is an early loser after announcing its interim revenue is likely to fall 23% following a 16% drop in output and lower commodity prices. The stock is down 3.82% to 856p. Lower oil prices have also hit Petrofac this morning, which has shed 2.65% to 642p. A mixed bag makes up the remaining bottom five with Legal and General down 1.93% to 53.45p, ICAP down 1.77% to 442p and British Land down 1.72% to 371p. However, Rio...