Four podia occupy the Wellcome Collection’s temporary gallery space. Three are stage sets: a living room, a pub and a funeral parlour, all recognisable as “typical” working class - in fact, the living room might have been based on Pauline Fowler’s dog-eared front room. The fourth, placed further back, is where Billy Bragg will intercut the dramatic action with a new set of songs with his three-piece band, plus engage in a bit of ad-lib banter that will direct the audience back and forth across the promenade auditorium.