Pathe News have put a few of their films on YouTube. There are a couple of radio-related ones:
1920's Walkman: https://www.youtube.com/watch?v=eAgBmK2wRFU&list=PL3kG3TM8jFKiuaGCl1IPBH9iEZCZj3oH2
First mobile phone ? (1922) https://www.youtube.com/watch?v=ILiLaRXHUr0&list=PL3kG3TM8jFKiuaGCl1IPBH9iEZCZj3oH2
TTFN,
Jon