The road is closed with a non regulatory sign, the vehicles and the the driver are allowed to access the road by law if they have a legitimate reason, the red sign has been deliberately placed in the area which should be open for access, I suspect by the man with the camera. The restriction can only be enforced if a police officer sees a vehicle passing the signage, then the officer would have to warrant that the driver of any of the vehicles didn’t have a legitimate reason for passing the barrier. That the law, remember the Highway Code is not the law, it’s a guide. Unfortunately the man with the camera is attempting to enforce a law which he cannot uphold.
What an absolute plonker this guy is. "You better not film my car!"..."Which one is your car?"..."That one." LOL you can't make it up.