UK Stocks-Factors to watch on June 23

June 23 (Reuters) - Britain's FTSE 100 index is seen opening 14 points lower at 7,425.7 on Friday, according to financial bookmakers. * GSK: GlaxoSmithKline Plc's new chief executive officer, Emma Walmsley, is shaking up the British drugmaker's portfolio of smaller products with plans to divest its MaxiNutrition sports nutrition brand, two people familiar with the matter said on Thursday. * Petropavlovsk: Shareholders voted for four new board member