This is the story of how four people, grouped together inside a set of offices five floors above a greengrocer's shop on Shepherd's Bush Green in West London, launched a golden age of British comedy. On any weekday morning, if you dare to clamber over the crates of fruit and veg that the greengrocer has allowed to pile up outside on the pavement, climb the five flights up the dangerously rickety staircase and creep inside the entrance to Associated...