I have done a little digging on this one today, and as i suspected there IS more to the story.
First I will say that the whole clip is apparently about 30 minutes long and I expect to get a copy soon

I will past it up for viewing ... or download.
He had been reported over a 3 day period and it included being reported by the chief constable of the area to whom he also overtook - apparently badly.
But having said that - I am not yet clear if any of those prior reports have had ANY weight in Court or not . Whilst I suspect not - the Chief may have submitted one which might well stand up ....
I do agree totally that much of the overtaking looks Ok, (from what we can see, and 'probable vision' that he can/cannot see), even after the bend apex his vision I suspect was OK. I totally agree that the end jump back in, in front of the van is careless driving at the very least, terrible.
The other area is that people overtake differently when being followed too and very little of this has even been mentioned BUT we will know more when we can see the entire Police video.
However a reporter, told me today, that the reason for the flashing of lights, at the very end of this clip, is due to the fact that there are cops up ahead waiting to catch the chap ! ....
The police calibration is not functional and so the camera was only being used for video evidence only.