So, after months of "shall i, sharn't i" as the clutch was slipping a bit (now getting worse)... i finally pulled the primary cover off to give the clutch a once over... Clutch is fine, though it will certainly benefit from a good clean and adjustment... But, discovered the primary chain has lost a few roller bearing sleeves so just as well i did get in there and have a look!
There's the three shards of roller sleeve. You can see the link that's missing the entire roller, and then the link that still has half a roller intact.