It could be! The company was from the 60s and made a lot of electronics. *dyne names were not unusual, so a movie director in the 80s who had been a kid in the 50s and 60s would have been quite comfortable with such a name.
There is a 1954 prototype[2] at the fabulous but small Museum of Berkshire Aviation near Reading, about 30 miles west of London.
[1] http://www.hmfriends.org.uk/faireyrotodyne.htm
[2] https://museumofberkshireaviation.co.uk/html/exhibits/gyrody...