Passengers fogbound in London Airport (long before it was Heathrow) take the title vehicle to a different airport to complete their journey. Meanwhile thieves have stashed their haul of gold in the bus' boot.
Enjoyable mix of comedy and crime, especially for Frankie Howerd's performance. Alexander's character is badly written (without giving any plot points away, his character is a fatuous incompetent), but the final plot twist is a satifsying one.