Our 2008 build MA TDCi sounded just like that from new, and sounded just the same when it was sold in2018 after 104,000 km.
I'd offer it is normal and there is nothing to worry about.
In any event the engine has a timing belt from the crankshaft and a chain between the two camshafts. The chain apparently needs little attention, but the belt should be replaced every 160,000 km or 10 years, whichever comes first.
This video:
https://www.youtube.com/watch?v=OWkTJToMW1M
shows how to replace the timing belt, if you wish to have a go (and it is necessary)
cheers