Stephen Deuchar’s decision to leave running Tate Britain to take over as director of the Art Fund seems puzzling. He was a surprise choice when he was brought from the National Maritime Museum 12 years ago and since then he’s driven a pretty straight course through what can be a minefield of tricksy exhibitions, dodgy attributions and controversial sponsorships, and can be regarded as a bit of a catch for AF chair David Verey, who might find his new CEO less of a personal challenge than the previous one. Who could replace Deuchar at Millbank though? Nick Serota has a penchant for foreigners, but it might be the opportunity to bring Sandy Nairne back into the fold from the NPG for which he left off being Serota’s number two seven years go. Them who for the NPG? None better, you might think, than a certain David Barrie, who’s always wanted to run a national institution, to square a circle.