UK Stocks-Factors to watch on Oct 23

Oct 23 (Reuters) - Britain's FTSE 100 index is expected to open 2 points higher at 7,525.5 on Monday, according to financial spreadbetters. * GSK: GlaxoSmithKline's gene therapy for the so-called "bubble boy" disease was approved by Britain's healthcare cost watchdog NICE, despite a price tag of almost 600,000 euros ($700,000). * GSK: The U.S. Food and Drug Administration approved GlaxoSmithKline's Shingrix shingles vaccine for use in adults aged 50 and over, a move wide