I think its Hydraulic, if so first check the clutch fluid level and make sure the master cylinder isnt leaking, look for fluid on the top of the clutch pedal to, if thats ok, check the slave cylinder down near the gearbox, the rubbers could have deteriorated, I think vx do a kit for around £20.
I could have water in the fluid and need changing as its hydrophilic ( think thats the word ) takes moisture from the air.
Or it could just need bleeding.
Always check the cheapest first :D