I just found this video of London from 1927, it’s pretty incredible having lived around the areas where the film first starts it’s amazing to see this in pseudo-colour!
Then and Now
And here’s the full 10 minute video –
The video was made by Claude Friese-Greene who’s father was an early day pioneer of cinematography. The colour was created by one frame being tinted red and the next frame tinted green, when played at full speed the brain makes the images appear as colour. The video above is better than the original as some modern day techniques have been applied. Loads more into at the BFI.