I personally would not have filtered down the left like that and positioned myself to the left if I was going to go right (especially on a mini roundabout where I could not put myself into a primary position before getting to the roundabout).
Instead I would have waited in primary in an appropriate gap (that is, if there was no room to filter right and find a safe visible, preferably primary, position behind the car at the front of the queue where the driver of the second car could see me - of course, there was no room in this scenario).
Looking at the video I cannot see that you communicated to the driver your intention to go round to the right (you may have), and in this case most people would assume you were going left, due to your positioning.
If you are going to filter left and then turn right, please communicate with the driver, by giving a clear hand signal that you are going right and looking back to make sure you have their attention (I see too many people not communicate enough with other traffic).
You have to think for drivers as well as yourself and try to anticipate where you can, I noted that the Vauxhall ahead had taken a shortcut over the roundabout, so I would be more than expecting over drivers to do that, so I would have perhaps gone more towards the centre (without going over it) than you did, while shoulder checking to try and keep the car behind in check until I was clear of the mini roundabout.
It was very naughty to be cutting the mini roundabout like they were, but that is the nature of a lot of people, to take the shortest, easiest and most direct route to get a task out of the way as soon as possible.
Of course we all make mistakes, and I have made a few, no one is perfect, and at least they didn't try to squeeze through you regardless.
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