In 1960 David stopped writing for "The Sunday Times", as she was unhappy about editorial interference with her copy; soon afterwards she also left "Vogue" as the change in direction of the magazine did not suit the style of her column. She joined the weekly publications "The Spectator", "Sunday Dispatch" and "The Sunday Telegraph". Her books were now reaching a wide public, having been reprinted in paperback by the mass-market publisher Penguin Books, where they sold more than a million copies between 1955 and 1985. Her work also had an impact on British food culture: the historian Peter Clarke considers that "The seminal influence of Elizabeth David's "French Provincial Cooking" (1960), with its enormous sales as a Penguin paperback, deserves historical recognition." Cooper considers that David's "professional career was at its height. She was hailed not only as Britain's foremost writer on food and cookery, but as the woman who had transformed the eating habits of middle-class England."