UK Stocks-Factors to watch on April 20

April 20 (Reuters) - Britain's blue chip FTSE 100 index is seen opening down 0.16 percent at 7103 points on Thursday, according to financial spreadbetters. * IHG: Global hotel chain InterContinental Hotels Group Plc said 1,200 of its franchised hotels in the United States, including Holiday Inn and Crowne Plaza, were victims of a three-month cyber attack that sought to steal customer payment card data. * RIO TINTO: Global miner Rio Tinto, on Thursday said first-quarter iron prod