After a career spanning 60 years, Sir Don McCullin, once a witness to conflict across the globe, has become one of the great landscape photographers of our time. McCullin's pastoral view is far from idyllic. He has not sought out the quiet corners of rural England, but is drawn, instead, to the drama of approaching storms. He has an acute sense of how the emptiness of his immediate landscape echoes a wider tone of disquiet. McCullin is based in...