These type of pre-war promotional films are fascinating to watch as it shows a long lost British Isles (and Empire?) with the fashions, street furniture, working practices, lack of motor vehicles and of course the flat A's of BBC English. I see the pylons were erected in winter as there was snow on the ground. And I bet it was freezing to boot.
Judging by some 1930's layouts on the exhibition circuit, some modellers should watch these type of films to see what was around at that period to ensure the correct street furniture, road markings, infrastructure, countryside, etc.