On the back of the British £20 note, J.M.W. Turner appears against the backdrop of his most iconic image. Voted the country’s favourite painting in 2005, ‘The Fighting Temeraire’ (1838) was Turner’s favourite too. It remained in his possession until his death; the 70-year-old artist swore in a letter of 1845 that ‘no consideration of money or favour can induce me to lend my Darling again’.