Fallout from Covid crisis has left event struggling financially after last year’s ‘traumatic’ fall in sales

The Edinburgh International book festival hopes a swathe of Booker prize winners, political leaders and a guest appearance by Greta Thunberg will help restore its finances after a “traumatic” fall in sales last year.

The world’s largest book festival celebrates its 40th anniversary in August with events featuring Katrín Jakobsdóttir, the Icelandic prime minister, the former Booker winners Ben Okri and Anne Enright, and the International Booker winners Georgi Gospodinov and David Diop.