As above the overtake on the elise was a bit late and forced the car offline mid corner. Not dangerous but laking etiquette. Apart from that they were putting no-one in danger. The following distance was fine as they obviously were very talented. I would bet on them being a racer of some sort, either track, rally or drift. Yes they binned it as they were on the limit and made a mistake.
Having said that you really shouldn't be at 10/10th's on a trackday no matter what your experience. A bit stupid but doesn't deserve the ripping being given.
Go watch the video again, that car had lost grip on the front, I suspect due to the front tyre deflating, also corroborated by the LADY driver looking at the wheel afterwards.
Someone who can drive like that, doesnt suddenly go off on an easy corner in that fashion with big understeer.
Really don't think it was a mistake, bad luck maybe, but that is track driving and I disagree about not going 10/10ths. Maybe you can't on UK track days, but on european ones you can, and that is the best place to do it.

