Director Rupert Goold has taken J B Priestley’s 1937 dramatised theory on the nature of time and threaded it with verve and invention. The Conway family are full of hope after the First World War, and by the start of the Second, full of disappointment. Priestley lurches experimentally between the periods, and it is during these moments of time travel that Goold’s production scores with some astounding effects. The play is almost, though not quite, as interesting as the production.