Here's a great film about life in London in the 1920's. It is unique in that it is not black and white. The colors are not sharp, but it is still great to have a better look at what the city was like back then.
Here's a quick description of the film from the video's page:
Incredible colour footage of 1920s London shot by an early British pioneer of film named Claude Frisse-Greene, who made a series of travelogues using the colour process his father William – a noted cinematographer – was experimenting with. It's like a beautifully dusty old postcard you'd find in a junk store, but moving.
London in 1927 from Tim Sparke on Vimeo.