UK Stocks-Factors to watch on April 26

April 26 (Reuters) - Britain's FTSE 100 index is seen opening up 9 points on Thursday, according to financial bookmakers. * PERSIMMON: Persimmon shareholders voted narrowly in favour of the housebuilder's controversial pay scheme for senior bosses at the British firm's annual general meeting on Wednesday. * BARCLAYS: British bank Barclays and digital payments firm PayPal have announced a partnership that will see them explore ways to combine their services for customers *