Following the world premiere of Wildefire, a new Roy Williams play about the Metropolitan Police, the Hampstead Theatre will revive Tiger Country, writer-director Nina Raine’s drama set among NHS staff. This means that the Hampstead repertoire suddenly resembles a mainstream TV schedule, with detective and medical procedurals in adjoining slots.The Guardian’s chief theatre critic, Michael Billington, recently argued that theatre is currently far ahead of TV in the treatment of political issues but, while this may be true in the narrow area of ecological politics, the screen surely has the edge on social policy. This mini-season in NW3 sets the test of whether playhouses can bring anything to the treatment of cops and hospitals that TV hasn’t and doesn’t on an almos