Four London Transport mechanics (Sir Cliff and his pals) convert a London double-decker bus into a mobile youth hostel and take a test-spin across Europe.
They plan originally to go to the South of France but an accident involving them with an old car belonging to three girls results in a change of plan to go to Athens where the girls have a singing engagement.
The stowaway ‘lad’ they discover turns out to be an American heiress and trouble and hi-jinx ensue.
After many adventures they reach Athens. Complications still arise but eventually, all is sorted out and the bus with its passengers sets off to return to London.
Hank B. Marvin