At this time of year (August/September) the Royal Academy of Arts is usually bustling, if not bursting, with visitors to the Summer Exhibition of all-comers’ art, of all qualities and none. It’s not just an exhibition to be viewed- with reverence, excitement or raised eyebrows; it’s also a fair. The art is mostly for sale. Little red “sold” dots grow like pondweed under many of the works (especially the prints).