I spent the evening in Cambridge at a dinner in honour of Judith Aronson, the American portrait photographer, who in 1979 was asked by J.H. Plumb, the Master, to document the Fellows of Christ’s.   She had set up her studio in the rooms of her husband, Christopher Ricks (her darkroom was in the kitchen), and we were each allocated 15 minutes in quick succession, photographed against a plain white background in the tradition of Richard Avedon.   But, unlike Avedon, she liked an atmosphere of informality and employed someone to make conversation.   It’s intriguing to see the set, thirty six years on, Jack Plumb seen from a side view, David Cannadine in a wide lapelled suit, some people easily recognisable.   I only half recognise myself.