The Summer Exhibition at the Royal Academy has opened with the usual mix of work by academicians, emerging artists and the lucky few who were selected from the public competition. It is a satisfying show, with something for everyone – abstract, experimental, figurative and conventional. As ever, David Hockney has pushed his art that bit further with a wall of huge photographic prints of trees on a non-descript road, yet he has added pigment and introduced details which give the work a beguilingly painterly feel.