Last week’s theft of a Leonardo in Scotland makes obvious the lack of security for artwork in many museums. “In recent years, the UK has become a target for the international gangs, who have learned that security of artworks in Britain is largely a matter of trust between owner and visitor. There are two famous stories about the Duke of Buccleuch that exemplify this. It is said the duke was once asked where the toilets were in the castle and he replied: ‘Along the corridor and turn right at the Holbein’.”