My initial reaction to the first video was how slowly everything seems to move in London. But it doesn't seem modern day is much better.

The second video is obviously slowed down to keep pace with the old video. Certainly the buses and horse-drawn carts would be a lot slower.

I don't think it's specific to London that in 1927 vehicles were slower than today...

considering the current London traffic, they were faster back in 1930's...