The Prime Minister and Chancellor are preparing a severely puritanical Budget, taxing amusements such as bingo, gambling and night-clubs out of existence. On the afternoon before its presentation, however, shocks are in store for both of them as each in turn appears to be the father of the pretty Shirley, result of a riotous post-party conference night many years ago. Numerous hectic developments are climaxed by a final, even less expected family bombshell...