Haygarth played a milkman in Whatever Happened to the Likely Lads? and made his film debut in the comedy film Percy (1971), subsequently playing many roles in police and historical dramas, as well as situation comedies.
V roli mladé Alice se objevuje Amelia Shankley a Charlese Dodgsona, panice a kněze fascinovaného dětmi, jehož svět poznal pod jménem Lewis Carroll, ztělesnil Ian Holm.