Had the same issue just over a month ago - it got steadily worse so I had the lot replaced, clutch Kit (bearing, plate etc and flywheel) supplied and fitted incl VAT £1k.. Was £600ish without Flywheel but felt I was better off doing it all in one go.
get in you tube and hear the sound of a problematic dual mass flywheel. if you car sounds like this, then is the DMF. I was hearing a sound "tak...tak...tak...." not with the same frequency when the car was idle and the sound was stopping once i was pressing the clutch pedal. if this is what you car does, definitely is the clutch release bearing....i change the bearing, the plate and the disk and everything is fine now. I didn't change the DMF as it was a waste of money to change it with out any problem but you take some risk in case is facing a problem in future although i dont beleive it will soon.