The Royal College of Art is holding a secret art sale. “Most of the 2,000-odd works in the show are by RCA students, present or past. Some, however, are by extremely well-known artists – including David Hockney, Bill Viola, Perry and Damien Hirst. All are on sale for £35 – but the catch is that as a buyer you won’t be told whom your work is by until you have handed over the cash. You could be walking away with the most fantastic bargain. Or not.”