The National Gallery was the grand setting for the party that followed The Devil Wears Prada 2’s London premiere this week. Donatella Versace held court in a roped-off area beneath Paul Delaroche’s The Execution of Lady Jane Grey. Meryl Streep, reprising her role as Miranda Priestly – Anna Wintour’s fictional alter ego – wore a red satin Prada coat as a nod to the film’s title and black sunglasses as a wink to Wintour. Glossy magazine editors from Spain, Germany and the Netherlands, flown in for the night, nibbled on fried chicken served with caviar and dishes of mac and cheese presented theatrically under silver cloches. It is ironic that the most glamorous and high-profile moment the fashion industry has known in years is the release of a film that ruthlessly satirises its demise.…