The Sharp End (1991)

This series sees Gwen Taylor's character widowed and wondering what to do with her husband's Debt Collection Agency. She decides to run the business herself, much to the chagrin of a rival, ruthless debt collector. Gwen employs a muscle-man, Carmichael, an illiterate hermit who rides around on a push-bike with a tape recording from Gwen of what he is to do. Together they manage to keep the business running, despite attempts from the rival collector to shut them down.