‘I sold Once for nothing, and made no money on it. Not a penny. I did the worst deal you could do’ - filmmaker John Carney on being 'young and and green’

John Carney’s phone is ringing. We’re in an elegant meeting room at the Westbury Hotel, just around the corner from the chatty afternoon tea drinkers, and Carney – one of the most celebrated filmmakers in Ireland – has forgotten to switch his device to silent mode. These things happen.