I agree both drivers were way too close, but the Highway Code does not say you have to give a lanes width, it says
"give motorcyclists, cyclists and horse riders at least as much room as you would when overtaking a car"
This is a really useless rule as some drivers will overtake a car with a foot betweed vehicles, if they then give the same room to a cyclist this is the result, no rule broken but a dangerouse overtake non the less.
I know this round very well and use every week. It's a 1 to 2 mile strate section of Rd. With one farm house. It has great view as you come down the hill towards Buxton of the Rd. It just seems like he was making a safe overtake of spaced out trafic. The person with the camera and sounding the horn don't know what's that about. There is a problem with weekend joy riders on some of the roads near us going 100+ in 40 mph speed limits.
Like this ?!??! Nooooo