 Saul Arkwright walks his dog close to Lord Ashfordly s estate when the dog is shot by one of Lord Ashfordly s guests Oliver Langley. Since Langley just drives off nearly hitting Arkwright in the process the latter see no other alternative than to make a complaint to the police. When the police do not do enough in his opinion Arkwright takes matters in his own hand. Vernon Scripps has had a new "bright" idea. He has bought a surplus U.S. Army half-track tank to drive tourists around the countryside. But since he has a boil in a very private place David has to drive the half-track for him. David only flattens half the village trying to get the hang of it.