Gilbert and Sullivan aren't among my theatrical must-sees; until now H.M.S. Pinafore existed for me only as a handy distraction technique if Sideshow Bob's after you. But I've enjoyed Sasha Regan's recent revivals so this had to be worth a look. Regan's all-male productions are becoming a bit of an annual institution, but all-male G&S also finds an unlikely historical precedent in the Second World War, where POWs would put on operettas to keep themselves entertained in Stalag 383. So this latest production has a more rough-and-ready feel than usual, with a framing device that sees a group of captured airmen break into song in their bunk beds. Actually, the archive photos in the programme suggest the real POWs managed to get together costumes at least as elaborate at the Union's productions usually provide, but there's a layer of fun in having life-jackets and collars co-opted to suggest the women's dresses and brooches.