UK Stocks-Factors to watch on Sept. 20

Britain's FTSE 100 index is seen opening 7 points higher at 7,338 on Thursday, according to financial bookmakers. * BAT: British American Tobacco Plc said on Wednesday its board has identified a lead candidate to succeed Chief Executive Nicandro Durante, who has said he intends to retire on April 1, 2019, after nearly 37 years with the company. * ASTRAZENECA: With smart cancer diagnostics, one-stop-shop diabetes kits and AI systems to improve ambulance pick-up