This document discusses using waste vegetable oil from restaurants as an alternative fuel for diesel engines. It notes that over 100 tonnes of cooking fat is poured into London's sewers each year, costing £7 million to remove. Some people are already collecting used vegetable oil from restaurants to fuel their diesel vehicles, paying the relevant taxes. The document argues that local authorities could establish collection programs to recycle restaurant waste oil into a fuel to sell, which could help reduce costs. It maintains that running on vegetable oil is legal and better for the environment than using petroleum.