The shoulder check was to try and see what the driver was going to do, given that I was clearly signalling my intention to avoid the pot holes, nice and early. The driver didn’t do what anybody in their right mind would have expected them to do ( wait a second, or at least give me the room I was obviously going to need ). In fact they did quite the opposite of what I’d expected them to do. Hence my annoyance.
Well. I have no evidence that you were signalling. I have no evidence that you were trying to avoid a pothole, indeed the combination of your camera and my phone screen doesn't provide high enough resolution for me to properly make out any imperfections in the road surface. I need to take that on faith.
What I do see is you shoulder checking as you drift off your line and closer towards the path of the van, pretty much as it passes. So what was the shoulder check for? You say you get close passes 'all the time' and then you say that the van driver did the opposite of what you'd expect them to do. So which is it and why did you not, as you saw the van approaching, hold your line until it had passed?
I know what I think happened.
Edit: I don't think I do see a shoulder check. That's a handlebar mounted camera isn't it? All I see is the bars/bike move.