E-i E-i Thud

A farmer trying to fiddle his agricultural subsidies uses fake grid references that turn out to be on Thud. When the Ministry officers go to investigate, they find themselves caught up in a funeral. But the Thuddians can spot them a mile away, and set about thwarting them with their usual efficiency. A romance doomed to fail, seaweed, memories of the slurry pit; all the usual unrelated ingredients go to fuel one final balloon flight.