A few years later, at a show put on by Antony d'Offay, I made an attempt to buy Freud's picture of Frank Auerbach (who had been my teacher at Camberwell Art School), a masterpiece in which one painter concentrates on another's concentration. Well, at least I took the first step and asked the price. It was £4,000. I was (and still am) baffled as to why the Tate, for whom it would have made a fine companion piece to its early Freud painting of Francis Bacon, had not bought it.