Suggest you go and get a new clutch cable. It sounds like the automatic adjuster has failed. You can get a cable from any Partco or Halfords. IIRC its fairly easy to fit - just a bit fiddly getting it off the pedal end.
Clutch problem symptoms--engaging nearer/nearer to floor,causing grinding.Indicated master/slave cylinder failure.Garage replaced same---no improvement.This indicated clutch failure.When gearbox was removed problem was found to be a bent clutch fork
Master/slave cylinder,clutch kit +clutch fork total cost parts+labour=950Euros.
This may be of interest to other drivers with similar clutch problems!!!!!!