UK Stocks-Factors to watch on May 18

May 18 (Reuters) - Britain's FTSE 100 index is seen opening down 14 points at 7,774 on Friday, according to financial bookmakers. * BARCLAYS: Activist investor Edward Bramson is calling on Barclays to end the bulk of trading activities at its investment bank, in a radical plan to cut costs and boost returns at the British lender. * RYANAIR: Ryanair said its issues with pilot staffing have stabilised, with would-be Ryanair pilots queueing up to join after the company decided