Great film, mostly shot in west London. The railway bridge could be across what is now the North Circular Road, although not quite sure. A gasometer just visible on the right?
At the end of the film, we have this gem...
...which shows the newly-built elevated section of the M4 at Brentford, before all the junctions were properly operational (the covered signage).
The closing seconds of the film shows North Thames Gas and Coles Priestman on the left, and Smiths Crisps and Martini on the right. The area this side of the gasworks is largely open still.
And I have here offset prints of this pic, showing the same place, and taken from the same spot!
Lots of detail in that b/w pic, so worth clicking on and enlarging.
You can even identify many of the cars in Agfa's car park!