Thrust bearing is worn. Had the same on mine for about 6 months before it decided to smash into the clutch plate resulting in a new clutch assembly. Over time the clutch should also start to feel a bit 'heavier' before it completely gives way. So start saving for a clutch replacement. I think you can replace the thrust bearing itself but after all that effort you might as well change the clutch plate whilst you're there!

 

Sounds like a CRB.

Mine was noisey for nearly 5 years before it finally went pop!

 

Thanks guys, you have confirmed my thoughts. The noise has only been there for a couple of weeks, hopefully it will hold up for my trip as no time to get it changed before I leave on Monday, if it goes it will have to be recovered.

 

Should be fine if its only been happening for the last few weeks. Lets hope so anyway!