Martin Guerre review – return of Les Mis duo’s melodrama reveals a surprise new hero

<p><strong>Old Vic theatre, London<br></strong>Matthew Warchus directs a radical and intimate revival of Alain Boublil and Claude-Michel Schönberg’s musical about a Frenchman who flees home</p><p>Some revivals overstate their revisionism but Alain Boublil and Clau