Looking back at the year’s West End theatre, a few shows stand out. First, the best. Vanya, starring Andrew Scott at the Duke of York’s Theatre, was an audacious and frankly barmy attempt to reimagine Chekhov’s sprawling family melodrama, Uncle Vanya, as a monologue. The risk was that it might come across as a lengthy pitch for a TV show performed by an incorrigible show-off.