In Beckett’s Happy Days a prattling Irish granny is buried waist-deep, and later neck-deep, in a refuse tip whose detritus inspires a rambling 90-minute monologue. ‘An avalanche of tosh’ was the Daily Mail’s succinct summary. Wings is similar but worse. Mrs Stilson (Juliet Stevenson), an American pensioner sheathed in white, hovers over the stage on ropes and talks non-stop gibberish.