Sorry, Colin, I didn't see your reply.
This might come in handy for anyone else with the same problem:
A German-sounding garage in Draycott diagnosed and fixed the annoying grating sound. The cam belt tensioner body was chafed through on one side, exposing the piston or whatever it is. There's no noise at all now!
I won't be going back to any of the previous garages after my experiences.
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