Galaxy - Galaxy clutch issue - Gregory II

I currently have problems with my vehicle whereby when I try to engage the gears, the clutch pedal falls to the floor with no pressure, and I am unable to engage the gears at all.

What might be causing this problem and how easy is it to repair. I am concerned it might be a large job. I also wonder if it is a common issue on this vehicle.

Your thoughts would be very much appreciated.