Well got the aux belt off, and now back on. Unfortunately is none of them. The aux tension-er is a little rough, kind of like if there was a little sand in there, so that may need changing, however still have the noise when car is running and belt is off. I took the cam cover off, and the one just below it. Noise definitely seems to be coming from in there. Is there anyway it could be the cam gears? There is a very small amount of movement whilst running in the left one. Cant quite see the tensioner, any way of uncovering it without a major job.
Any help very welcome!