ok, what the hell could this be...

I was driving home from work on Friday afternoon and as I queued in traffic, I put my foot on the clutch as there was a snapping noise and the pedal hit the floor....noooooo! Well and truely marooned in Basingstoke in rush hour blocking the road!

Any idea whats wrong with it? Clutch cable maybe?

The cossie is at some pikey recovery yard as all the local garages would have been shut. I just want an idea of what is wrong before they try and rip me off repairing it!