I spent part of yesterday looking at and leafing through an absurdly fat, but in many ways fascinating book of interviews with the leading figures in the arts, including many RAs (Ron Arad, David Chipperfield, Antony Gormley, Thomas Heatherwick, Grayson Perry, not to forget several recent graduates of the RA Schools – Eddie Peake, Prem Sahib and Lynette Yiadom-Boakye).   Half way through reading it, I realised that it is as close as we are likely to get to an analysis as to what makes for the success of London’s creative economy.   And what are the answers ?  Easy immigration, access to cheap housing and studio space, good quality free art education, a premium on, and belief in, creativity independently of economics, the melding of fashion, the performing and the visual arts.   Now there’s an interesting lesson.