The driver of the dashcam car - “BK10 YAD” (white Mazda), was also in the wrong here...
Pulled out of the junction at the roundabout too soon by the looks of things... then when the little blue car pulled out (too soon, they should’ve waited, yes) the “cammer” should have instead slowed down, rather than weaving about at those dangerous speeds around a roundabout - a place where it is known accidents are far more likely to occur in the first place.
As someone also said on here - if you have the time to react by blaring on your horn, you should at least slow down sooner than that. Slow down.
If the original video owner decides to delete the video (which he probably will ) it can still be seen on various compilations so people can still see what an amazing driver he is
First clip on this compilation