my clutch went the other day, if you look box end, see if it's come out of the little rubber bung. if it has, theres a little clip under that, on mine that clip had rusted and snapped clean, so whenever you press the clutch the pedal just stays to the floor, but you can still pull it out, and press it.
does that make any sense?
always worth a shout at least, got one from a scrapper for 2 quid. otherwise i think the other common fault is the clutch release arm breaking