“A 2004 study estimated that there were more than 400 galleries in London – probably the tip of the iceberg, as temporary spaces come and go and artists open their studios to sell direct. An Arts Council England report has estimated the contemporary art market as worth £500m – unimaginable even a decade ago. The London art boom will be seen at its most intense next week, when Frieze art fair flings wide its doors… And, just when you think London cannot take any more, still more commercial galleries appear.”