UK Stocks-Factors to watch on Sept. 14

Sept 14 (Reuters) - Britain's FTSE 100 index is seen opening up 23 to 25 points on Wednesday, or 0.3-0.4 percent, according to financial bookmakers. * The UK blue chip index closed down 0.5 percent at 6,665.63 points on Tuesday, extending its decline after a steep drop in the previous session as oil stocks came under pressure and Associated British Foods was hit by broker downgrades. * ASSOCIATED BRITISH FOODS: Snack foods company B&G Foods Inc is in talks to acquire ACH Food Compa