When you look at The Plank or Futtocks End you note that they were both shot on film. They were shot in the late 50s and mid 60s. That this was possible was due to innovations in camera and film technology. Have a look at the link below where you will find a brief description of the Arri35. This camera was lightweight and quite portable. it enabled films to be made with small crews and not very much money. In addition if you look at the previous post you note that faster film emulsions facilitated shooting beyond the film studio.
http://cinematechnic.com/resources/arri_35-2.html
