The Clampetts are concerned Mr. Drysdale is worrying too much about their money. When Jethro misunderstands and believes Britain's queen is broke, the family heads to their English castle to help her out.

The Clampetts fly to London to give the Queen the deed to Canada they purchased. Waiting for an appointment with the Queen they stay at Clampett castle, where Granny is thinks they are at war with a neighboring castle.