RC:

Way too fast and didn't pay attention... enlightened (even if that other car actually took his right of way...I think...unless there was a right before left rule, not sure how this works in the UK).

There is no indication that the driver of the Lamborghini was traveling too fast especially since the video starts near the time of impact with the Mazda.  Another factor to consider that the Lamborghini is lefthand drive and the driver's vision is blocked by the wide A-pillar, making the hazard less apparent.