Did actually go to feel the surface by hand, and it was quite smooth/slippery.
I was right behind Mark when it happened and it was strange the way it suddenly broke out.
Mark caught it, which looked normal, but then it went all weird and broke the other way.
Afterwards when talking to Mark, it turns out that after he caught it and hit grippy tarmac, the traction control decided to step in.
There was nothing Mark could have done at all.
The car was actually completely airborne for a second, at which point I presume Darren bumped his head on the roof.
Most bodywork damage is on the front, sides and rear seem to have gotten away with it.
As to any damage that is non visible is yet to be established, but on first glance it looks like steering is buggered to a degree, rear camber arms, possibly front suspension struts and all the wheels have been damaged.