George Shuttleworth (Formby) is a chimney sweep from Wigan who dreams of winning the Isle of Man TT. Unfortunately, George's attempts to secure a factory ride with the Rainbow Motorcycle Company are unsuccessful and consequently he resorts to entering his own machine the "Shuttleworth Snap", a motorcycle derived from an old Rainbow machine.

George Formby as George Shuttleworth
Florence Desmond as Florrie Dibney
Edward Rigby as Grandfather Shuttleworth
Florence Gleason as Mrs Shuttleworth
Beatrix Fielden-Kaye as Mrs Horrocks
Howard Douglas as Turner
Jack Hobbs as Bert Tyldesley
Alf Goddard as Norton
Peter Gawthorne as Mr Higgins
Eve Lister as Rita
Evelyn Roberts as BBC Commentator
Ernest Sefton as Mr Hardacre
Arthur Young as Doctor