The Sunday Times regular was asked to curate the Political room in Rude Britannia, Tate Britain’s extensive examination of the funny side of British art. The centrepiece of his display is a giant caricature based on a work by James Gillray, and we caught up with him as he began painting his updated version on the gallery's wall. Between brush strokes he told us about his affection for Gillray and the importance of modern satire.