UK Stocks-Factors to watch on Feb. 2

Feb 2 (Reuters) - Britain's FTSE 100 index is seen opening 9 point lower at 7,481.7 on Friday, according to financial bookmakers. * ASTRAZENECA: Array BioPharma Inc on Thursday sued AstraZeneca , accusing the pharmaceutical company of refusing to pay required royalties for a cancer drug after entering into an $8.5 billion collaboration with Merck & Co. * PROVIDENT FINANCIAL: British lender Provident Financial Plc will appoint its interim executive chairman, Malcolm Le May, as t