Titian was one of the great painters of the Renaissance. The great biographer Vasari concluded that “Titian had invented a new form of art ‘made up of bold strokes and blobs, beautiful and astonishing because it makes paintings seem alive.” Every painter that has followed him has been influenced by his work in some way. So why, in 400 year, has there never been a British exhibition of his work? Now London’s National Gallery has managed to beg and borrow more than 40 of Titian’s finest paintings for an exhibition of his work.