Re: Clutch Slave Cylinder?
It is unlikely to be the actual clutch failing and a hydraulic failure at the same time. Sounds like hydraulic seal failure to me. Lack of clutch fluid pressure.
Could be either the seals in the master cylinder or slave cylinders but unlikely again to be both.
1. Have a look in the car, above the clutch pedal, find the connecting rod, is there any fluid around this area or on the carpet?
2. Have a look under the bonnet at the slave cylinder mounted on the bell housing, again look for leaks.
It is possible that the faulty cylinder is leaking internally in which case there will be no outward signs.
I think cylinders are around £70 - £100 each for genuine parts and a lot cheaper for pattern parts.
Forget the actual clutch for now, sounds like the garage is out to make an extra buck or two.