Damned if you do...

I cant see if you did, but the only thing I might have done would be look round and signal that I was moving out.  This might have stopped the driver passing, but it might not.

The driver was thoughtless for trying to pass when it was obvious that they would have to stop behind a parked car.  The question should be what the BMW driver might have done differently!

I was cycling home normally yesterday when I was close-passed out of the blue by white Zafira YK62 LHA and the male driver shouted at me out of the passenger window which had been lowered for the purpose by the female passenger. White now seems to be the go-to colour for offending drivers. In keeping with the theory that there's generally something else wrong with people who shout maniacally at cyclists (didn't hear what-presumably some sort of insult), the MOT expired on 31.8.22. The police will do nothing whatsoever about either offence, as they don't care what happens to cyclists who deserve all they get, and absence of MOT and VED is normalised in Lancashire now

I don't think I would have done anything different.

I had a very minor one yesterday with 2 cars stopped at a mini roundabout and driver 3 decided to overtake and get in front even though the amount of space was pitiful.

They abandoned when I did not yield.

The only hand signal required in this situation is not found in the HC and should be deployed after the manoeuvre. Brakes required during.

Anyone suggesting that a motorist is going to pay attention to a hand signal when they have failed to notice a van and a look back categorically does not ride a bike. They do possibly drive a BMW and spend life in a dire spiral of low confidence about their tiny willy and tinier intellect.

The only thing I personally would have done differently is not to shout but just report it to the police.  I don't like bullying drivers getting away with it as it just encourages more bullying with potential consequence for less confident riders. I wouldn't criticise any one else for braking and pulling in earlier though.

Not much, I reckon. Sometimes, I have taken to waving my right hand aggressively in a 'slow-down' movement when I spot a poor overtake about to happen right behind me, after moving into primary and shoulder-checking. However, in this case I can see that being difficult both because you'd need both hands covering your brakes, and it would've been hard if not impossible to perform this relatively complex action while moving into the right lane to avoid the van, shoulder-checking AND braking at the same time. It's one of them - the obvious incompetence from the driver is not seeing how complex the situation was in front of them anyway and still choosing to make the maneouvre, thus only worsening it. 

Seeing the cyclist's road positioning, observation of the hazard ahead and basic ability to judge speed and distance would have made it obvious to any driver with the intellect of a gerbil or higher that they weren't going to make that daft overtake.

Only thing you could realistically do different is dive towards the curb and brake to safety at the first sign of trouble, but realistically when in that situation, your own primitive driver brain is thinking that the car driver isn't going to actually follow through and there is always a case to be made that you stay consistent with regard to speed and course as your own evasive actions may actually confuse the driver further.

Assertive riding can't prevent a driver making a stupid move, but it mostly can create space to enable the cyclist to take evasive action. Riding in primary worked here as the BMW used the opposing lane to pass.

You managed to handle it with a shout and a swerve, with a fast unfolding situation like that you do have to react on instinct. But as Awavey says, I think once the car was committed, a better option would be to move back to secondary and brake, to let them get past. Although you would have to consider the following riders wouldn't crash into the back of you.

I don't think you could (or should) have done anything different in advance. However, when watching the video it appears* that once the BMW driver comes into shot, the more prudent course of action may have been to slow down and remain behind the BMW. 

*I note what you say about the camera angle distorting things, and in reality you may feel you could not have safely braked hard enough to end up behind the BMW. 

the issue is youll always be subjected to a MGIF there, because the majority of drivers will only focus on you as the primary obstacle and not the secondary bit theyre driving into next.

So I think once the BMW commits to the overtake of you, Id have been tempted to just let him go ahead and force him to own his mistake, whilst I appreciate it baulks you for something thats not your fault and you have to make a rapid stop and worry that the riders following you are paying enough attention to that, you kind of have to ride it expecting you arent going to get through that without someone overtaking you first and possibly even second.

and the danger to go through the gap is you're instantly in the door zone of the parked van and you then had the pedestrian stepping around it who is taking their cues off the motorised traffic for if its safe to be there and not expecting or listening out for you, a second or two earlier in their stride and youd be in collision, which would almost certainly be wholly pinned on you.

plus then Mr BMW is now stuck behind you again, he's already demonstrated his poor situational awareness, and is likely to make even more of hash of the next overtake as now he almost certainly believes youve held him up, and might try when theres even less of a gap so becomes much less safe for you.

Just like Lancashire, but with better roads

I bet if you put that on FB you'll get lots of great advice...

I wouldn't have done anything different.  BMW driver.  Not reading the road.  MGIF.