At the British box-office in 1971 the movie out-performed the James Bond film Diamonds Are Forever (1971) but this was only because the Bond movie did not launch until December whereas this picture had debuted in the UK in July.
This was the most financially successful film in Hammer's history.
Bob Grant, playing bus conductor Jack, had actually worked in real life as a bus conductor in order to pay his way through RADA (the Royal Academy of Dramatic Art).
First of three "On the Buses" cinema movies. The second was Mutiny on the Buses (1972) and the third was Holiday on the Buses (1973). All three pictures were made in consecutive years and were spin-offs from the popular television series On the Buses (1969). Harry Booth directed the first two, but not the third.
The driving test scene where Stan is being marked by the insurance rep was filmed at London Transports maintenance and testing facility at Chiswick Works.