^^ Nice plug there
There's a few possible culprits causing the issue as Phat_Controller mentioned his was different.
i had broken 2 pedal boxes due to having the same stiffness and creaking as yours. After all of that I ended up changing the cable too, my gearbox went caput after a few more months. So after I had got that re-cond my clutch was very light and smooth and I still have no more problems (fingers crossed).
So the cause for my clutch to feel like yours was due to the gearbox straining the clutch, which caused the pedal box failures.
So it could be that, the clutch, cable, bearings like phat controller or the pedal box itself. They're prone to cracking at the joint where the clutch pedal sits due to crap welding. Any other issue can cause this part to fail.
Hope you get it sorted and if you can then head down to Eastern Dubs and we'll have a look at it.