UK Stocks-Factors to watch on July 20

July 20 (Reuters) - Britain's FTSE 100 index is seen opening around 13 points higher on Wednesday, or up 0.19 percent, according to financial spreadbetters. * The UK blue chip index was flat in percentage terms at 6,697.37 at the close on Tuesday, after closing on Monday at its highest since August last year. * UNILEVER: Unilever Plc said it has agreed to buy razor-maker Dollar Shave Club for an undisclosed sum in a deal that would expand the consumer goods group's catalogue o