The motley cast of characters includes a dodgy, pockmarked contractor (Mark Lee), a hopelessly unhip coffee-shop boy (Henry Thia) and tattooed loan sharks, all of them relentlessly chasing money.
It is the first time a national British institution has agreed to serve coffee which bears the official Fairtrade Mark label guaranteeing a fair deal for plantations in developing countries.
Service stations pay their bills on money made when people go inside to get things like coffee and Ring Dings, which are often sold at a decent mark-up.