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[dave the builder]

If the problem is BEHIND the belt cover 
you best STOP using or even starting the car and check the timing belt etc  PDQ
a shredded timing belt ,due to failing tensioner, idler or just bad belt only makes a repetitive sound for so long 
then the engine dies 

Done in 2021 apparently.

the engine will be DONE in 2023 if the belt snaps 

[YZ250]

I’ve mentioned this on here before but many moons ago I had a new cam belt kit fitted on my Omega V6 by a garage just before going on holiday. I towed our caravan some two hundred miles to the site and when I was parking up on the pitch I heard a jingling noise. The jingle was coming from behind the cam belt cover and was constant. As a pessimist I always carried a near full toolkit in the boot so I spent the first day of my holiday stripping the car down. I found that the top adjuster pulley had worked loose and was jingling. With no locking kit I had to reset the crank/cams to the correct position and use bits of wood to wedge the cams. Luckily for me nothing had moved so it was relatively straightforward to sort it out. This is why I always stress the importance of tightening the adjustment pulley bolt whilst holding the nut at the correct tension, as they go opposite directions to set. I wished I’d have done it myself in the first place now.    As I said, mine was a constant jingle so hopefully not that but it does need investigating. 

[johnnydog]

A different car altogether (Audi A3 2.0 TDI), but my son heard a metallic tinkling sound which he said lasted about 5 seconds but then went away.  All's OK he thought. Carried on and the engine then came to an abrupt halt. Rang me, and I found the alternator pulley had sheared, and the auxiliary belt had broken and come off, got wrapped round the crank pulley under the timing belt which had jumped several teeth, destroying the valves in the cylinder head.
Due to its age and mileage it wasn't worth repairing....
Moral of this story - any metallic tinkling sound, switch off immediately and investigate the reason. Could be an expensive mistake - as my son found out.....

[grifter]

Cool, thanks for all the replies, I think now that I'm feeling this rubbing from the cover, it be worth investigating the TB. I don't think I could rest until I had tbh. Won't be doing it right now as car still in Winter mode but will get to it in the next Month or so and see what's what.

Luckily I heard the sound it was only for a few secs, you wouldn't hear it unless you were standing at the engine bay right after start up.

[Migv6 le Frog Fan]

My Omega has the rubbing sound behind the belt cover when first started up. My previous Omega also did the same thing.
Im pretty sure there was some discussion about it on here many moons ago.

[Doctor Gollum]

Any rubbing on the cover will be obvious with parts off.