The legend on the sign reads ‘The Captain’s Word is Law’ and so it is on the boat ferrying a group of Beckettphiles to Devenish Island for a sunset performance of Ohio Impromptu. When it comes to Samuel Beckett’s plays, however, even beyond the grave Beckett remains very much the captain, with his estate watching closely for any interference with the meaning or spirit of the work. However, as director Adrian Dunbar demonstrated last year with Catastrophe – his striking directorial debut of Beckett – following Beckett’s guidelines is the surest way to success. “If you start fiddling around with…