A little birdie tells Guido that pugnacious diarist Tim Walker, formerly editor of the Telegraph’s retired Mandrake column and most recently found at the Mirror, is off to the Mail on Sunday. Walker’s inside track on the world of hard-partying aristos is rivalled only by the daily’s Sebastian Shakespeare, and is probably better suited at the MoS than a redtop. Guido hopes this means Tim’s Twitter claws will be back out and we can look forward to some more outstandingly catty bitch fights with the Times Diary…