Born just fourteen months apart, one in London and the other in rural Suffolk, J.M.W. Turner and John Constable went on to change the face of British art. The two men have routinely been seen as polar opposites, not least by their peers. Differing in temperament, background, beliefs and vision, they created images as dissimilar as their personalities. Yet in many ways they were fellow travellers. As children of the late 18 th...