I Swear review – biopic of pioneering Tourette syndrome activist is funny, fierce and full of heart

Kirk Jones’s moving film about of John Davidson, the man who taught Britain about Tourette, offers compassion and catharsis

Feelgood true-life heart-warmers about courageous people overcoming medical conditions are common enough. But not when that condition zaps and jabs and stabs at the genre itself, piercing the carapace of sentimentality while surreally commenting on the form and on the demure niceties of polite society, in which we all keep our thoughts to ourselves.

Kirk Jones’s terrifically warm, generous film is about real-life activist John Davidson, who is from Galashiels in the Scottish Borders and has Tourette syndrome, with its tics, compulsive behaviour patterns and random obscene shouts. He was awarded an MBE in 2019 for his work educating the nation about the condition since he first exhibited its symptoms as a teenager in 1989, as captured in the BBC’s sensational documentary John’s Not Mad. I Swear contains a great performance from Robert Aramayo, full of intelligence and charm, and it raises relevant questions about the overdiagnosis debate surrounding conditions such as ADHD and autism, as well as the larger tonal point of how, when and whether to laugh at John or with him.