Graham Linehan's stage adaptation of The Ladykillers succeeds where the Coen brothers failed: it's actually funny, says Peter BradshawGraham Linehan's new stage-adaptation of the classic 1955 Ealing movie The Ladykillers, directed by Sean Foley, is up and running in London's West End. My colleague Michael Billington has delivered his verdict and I went to see it the other day. The questions this production throws up …