Trevor, a keen gardener, decided to try out one of the novel ideas from Nick Albery's Institute of Social Invention. Human excrement is somewhat toxic to plants, but can be turned into useful compost by mixing with straw and allowing to decompose in a black plastic binliner. Trevor accordingly collected a mountain of poo from Frestonians and proceeded to grow tomatoes on the resulting mulch. It worked very well but hit an unforseen snag, that nobody had any interest in eating them.