They would need it there for two reasons. Firstly to avoid getting stuck in dreadful, stop/start London traffic which would ruin the film and secondly to stop the inevitable dickhead getting too close and trying to get his ugly mug and/or car on TV.Was that actually a police escort?! And did the camera car guys always wear helmets? I don't think I've ever seen either of those before.
And shots from the set
Jeremy Clarkson - Filming starts here tomorrow morning. 8 sharp.
23 Feb 2016
Richard Hammond - @JeremyClarkson I'll bring a coat. No, wait..
23 Feb 2016 ? Barbados, Barbados