Cavorting around in the river!

I was out with a client this morning when we saw someone get off a bench, supposedly carried away with their virtual reality headset and ending up interacting with the game in the river. 
We recognised Dom Joly the comedian and we looked around for the hidden camera but if there was one there we could not see it. If you find yourself watching trigger happy TV and you see Bourton then look out for me in the background!
In extras,  a front view.