Stephen Sackur speaks to one of Ireland’s most successful businessmen Michael O’Leary – the chief executive of the low cost, no frills airline, Ryanair. In terms of passenger numbers it is Europe's biggest airline, carrying more than a hundred million passengers per year. But what impact will the UK's looming departure from the European Union have on Ryanair and the Irish economy?(Photo: Michael O'Leary, CEO of Ryanair, holds a press conference with Boeing, 2014, New York. Credit: Andrew Burton/Getty Images)