In 1971, Tove Jansson paid one of her many visits to London, where 1960s fashion hangovers made the whole city look like ‘one big fancy-dress ball’. When not partying to celebrate 20 years of British editions for her Moomin books, she and her life-partner ‘Tooti’ — the artist Tuulikki Pietilä — caught performances of Hair (‘a grand glorification of psychedelic hippiedom’) and the ‘racy’ Canterbury Tales musical.