UK Stocks-Factors to watch on Aug 16

Aug 16 (Reuters) - Britain's FTSE 100 index is seen opening up 6 points on Wednesday, according to financial bookmakers. * BHP: Hedge fund Elliott Management has raised its stake in BHP Billiton , to 5 percent, stepping up a campaign to make the top global miner quit all or part of its petroleum business, boost returns and ditch its dual listing. * BRITAIN-EU/IRELAND: There should be no border posts between Ireland and the British province of Northern Ireland after Brexit, Britain s