I'd say all the crap about council functions e.t.c sounds like a daily mail reader but I think any type of reading may be beyond the driver of the camera car if he can't appreciate he was at least as bad as the Nissan driver in this video
So he was in front of you when two lanes merged and you accelerated with the specific intention of cutting him off probably because you knew you had a dashcam and wanted footage ( assuming it's your footage and you havn't stolen it to get youtube views .
You as much of a problem as the guy in the Nissan with your aggresive driving mentality at some percieved slight of another care daring to move one space ahead of you .
There is no rule that the car in the outside lane gets priority ,you are mistaken although it does explain why you were in that lane coming up to the roundabout when the lane to your left was clear .
Ah man imagine being 'named and shamed ' he's not going to get over this quickly , the complete lack of evidence and the here say are going to sting so bad poor guy .
That driver needs reporting, send your video to whoever it may concern