UK Stocks-Factors to watch on May 2

May 2 (Reuters) - Britain's FTSE 100 index is seen opening up 20 points on Wednesday, according to financial bookmakers * STANDARD CHARTERED: Standard Chartered Plc posted a better-than-expected 20 percent rise in pretax profit for the first three months of the year, helped by a surge in loan demand and improvement in asset quality. * RBS: State-backed Royal Bank of Scotland is to cut around 792 jobs and shutter 162 branches following a review of its network in England and Wale