Redvers Potter arrives at work to find his nameplate being removed from his office door. At 12pm his company, Pottermints, is to be taken over but, until then, he is still in charge and he means to assert every last vestige of authority he has.

Potter has another bad day. His sister Harriet and her dreaded husband Willy have to extend their visit because, despite all Potter's efforts, their caravanette remains unroadworthy.