In conversation with Anne McElvoy, Boris Johnson discusses leadership ambitions, what Cicero has to teach us about politics, and why a politician should sometimes dare to be dull. Sarah Frankcom tells Anne why she and Maxine Peake are reviving Shelley's poetic account of the Peterloo Massacre of 1819. New Generation Thinker John Gallagher guides the listener on a romp through 16th century phrasebooks for travellers. And writer Tim Lott and critic Kate Muir discuss depictions of holidays gone wrong in film.