Tina is going on a two-week Mediterranean cruise for Christmas so the Porters drive her to Southampton docks,where Ben crashes into the captain's car and the crew's van. Bill,Ben,Rona and David go on board to see her off but discover that the ship has sailed before they can disembark. Whilst they hide Tina tries to sneak them meals but is side-tracked when elderly lecher Fletcher takes a shine to her so Ben dresses as a waiter to steal food but ends up serving the captain's table. Rona finds herself on stage with the ship's dance troupe whilst Fletcher transfers his attentions to a disguised Bill. Finally they are put ashore - in a life-boat, in time for the finale song, 'Be Kind To Your Parents'.
