Following to closely from yourself possibly hard to say without footage.
However if the lights changed to amber and it is not going to cause an accident (from the view of the blonde in front) then she did the right thing even if she was over the line.
Honestly I think the cyclist could have taken a better road position. Secondary position is not recommended at a roundabout, you should be in primary to avoid situations like what happened here.
Think yourself lucky. London and one other city are the only cities who have laws to enforce this abuse. When other people from across the country complain and nothing much can be/is done.
Same idiot, different day. As you can see from the video, this road is three lanes, one for straight on and two to turn right. This clown shoots up the straight on left lane and then cuts across turning right.
Crash into my parked car!!!