It is May 1944, two weeks before D-day. Britain stands poised for the long-awaited invasion of France - thousands of troops wait anxiously for the orders to come for embarkation. MI5 is horrified to discover the top-secret codewords for the invasion suddenly appearing as clues in the Daily Telegraph crossword. Two agents are immediately dispatched to confront the culprit, the headmaster of a boys' school in southern England.

This gentle comedy follows the antics of several British families on holiday in France. The 'Perfect' Marriot family watches 'Topless' try to turn topless beaches into bottomless ones and 'Prat' discipline his family like boy scouts. But will they be able to withstand the charms of 'Early Bird' or the savagery of her husband?