Very clever but unless Lewis Hamilton got his hands on a V16 over the winter it must surely be a fake. Modern road signs and snow on the road are possible clues. Jenks had a road outing in a Lotus 12 on Christmas Day 1957 but you'd probably get life for such a stunt these days. Especially if you got further than the first bend (unlikely from everything I've ever heard about the V16).
I can see nothing on the film to suggest it is filmed from a single-seater, let alone a V16 BRM. Simply an overlaid soundtrack. To be fair, it doesn't suggest it was filmed in 1953, it simply states '1953 V16 BRM'
This is mainly on Red Bull Audi (Carlos Sainz) beating the 'record' of Sitges Terramar (Spain), but it contains also news reel material on the GP of 1923 (ca 1min 10 following), and shots of the track today:
Gary, thanks for this; what a fascinating short film.
I remember the Autocar summary of the Buchanan report showing proposed high level London fly-overs around the Euston Road / Bloomsbury area. I think it's better without them! Perhaps the congestion charge / improved public transport is a better approach to an almost insuperable problem.