The clutch action (from the pedal) seems to get a bit 'sticky' after a long run. I can also hear a sound from the gearbox end when i actuate the clutch (engine turned off, in my garage). When it's cold, the clutch action (from the pedal) feels much smoother and quiet. It's only when it warms up that the sticking occurs. I've recently changed the gearbox oil from 80W-85 to 85W-90 and that's helped a bit.

Could it just be the external coiled spring on the external clutch actuating arm or something more threatening? This has been going on for about a year now...