So was checking my chain tonight and noticed what looks like a few links might be binding - they look out of alignment compared to the rest. I've been keeping it on the loose side of the range in the meantime. Had the bike for a little over 12 months now (10,500kms) so it's due for a service anyway, looks like a new chain is in order. I guess if that's ends up being the worst result then I no complain .

Also got hold of one of those Tutoro automatic chain oilers a while back and managed to install it myself, seems to have kept it in a lovely oiled looking state and the rear sprocket much cleaner.