Britain's FTSE 100 index is seen opening 18 points higher at 7,310 on Thursday, according to financial bookmakers. * VODAFONE: Vodafone will receive a warning from EU regulators about possible anti-competitive effects from its $22 billion deal to buy Liberty Global's German and eastern European assets, two people familiar with the matter said on Wednesday. * OPHIR: London-listed Ophir Energy Plc said on Wednesday it agreed to be bought by Indonesian oil