What happened? :s
One of the fingers on the pressure plate decided it didn't want to be part of the pressure plate anymore. Whizzed around inside the housing and what the photo doesn't show is that as well as those huge gouges it also put three holes in the housing all around half an inch in length and around 1mm thick. Very strange because the clutch action felt fine, albeit the biting point was a little higher but there was absolutely no slipping or crunching. Unbelievable really, the only sign there was a problem was an oil leak...
I'll have to get some more photos next time I'm there.