UK Stocks-Factors to watch on Feb 15

Feb 15 (Reuters) - Britain's FTSE 100 index is seen opening 35 points higher at 7,248.8 on Thursday, according to financial bookmakers. * ANTOFAGASTA: Chilean mining company Antofagasta received environmental approval for a major, $1.1 billion revamp of its Los Pelambres copper mine, the regional government of Coquimbo said on Wednesday. * GVC/LADBROKES: Online gambling company GVC has given away its Turkey business, hoping the move will help smooth its takeover of Ladbrokes a