John Singer Sargent, Cornelia Parker: this week’s new exhibitions

From John Singer Sargent’s bohemian portraits in London to Cornelia Parker’s exploding shed in Manchester, Skye Sherwin and Robert Clark find out what’s happening in art around the countryBy looking at John Singer Sargent’s paintings and sketches of his bohemian friends, this show sets out to challenge the Edwardian star portraitist’s glossy image. He was a society insider, court painter to Europe’s moneyed upper crust who could be relied upon to turn out masterfully realised, flatte