Interesting trend that the wives of our leaders should be taking on a role as mentors of the cultural community. Mrs Darling, the chancellor’s wife, is the latest to have summoned leaders of the arts world to informal discussion about how to carry the arts through the recession, but I wonder if she had the right guest list. Christopher Frayling is the former chairman of the Arts Council, John Tusa the ex-managing director of the Barbican, and Jenny Abramsky no longer the head of BBC Radio…