This brand-new five-floor spread opened last May in a Georgian town house that was once a brothel. The notorious, headline-grabbing gallery is run by Steve Lazarides, the onetime art director of London’s now-defunct SleazeNation magazine. He was the first person to print a poster by media-shy graffiti artist Banksy and helped make him a global phenomenon. (Brangelina and Christina Aguilera have bought Banksy works from him.) Lazarides is also known for prankish, punk artists with a wicked wit, such as Jonathan Yeo, who makes detailed collage portraits of politicians using cutouts from vintage porn magazines.