The story concerns Don (Cliff Richard) and his friends (Hayes, Green and Bulloch) who are bus mechanics at the huge Aldenham Works in Aldenham, Hertfordshire. During a miserably wet British summer lunch break, Don arrives, having persuaded London Transport to lend him and his friends an AEC Regent III RT double-decker bus (and not a later AEC Routemaster as often quoted). This they convert into a holiday caravan, which they drive across continental Europe, intending to reach the South of France. However, their eventual destination is Athens, Greece. On the way, they are joined by a trio of young women (Stubbs, Hart and Daryl) and a runaway singer (Lauri Peters), who initially pretends to be male, pursued by her mother (Ryan) and agent (Murton). The movie was a box-office hit, thus repeating the success of Cliff Richard's earlier film ''The Young Ones (1961 film)'' (1961).