Is Deller the best artist whom collectors rarely buy? And why is he showing in London, a city he tries to avoid?

A British conceptual artist, an Iraqi artist, and a US soldier who served in Iraq travelled from New York to Los Angeles with the remains of a car destroyed in a Baghdad bomb attack in tow

Turner prize-winner to take the controversial show on a three-week tour of the US in late March

Grayson Perry defrocked