Thanks very much for this Thor. I have realised that I was looking at the wrong sprockets and chain in the workshop manual and the job I was planning to do is much bigger than I thought, requiring removal of the LH cylinder head and a significant set of special tools. I don't have the facilities to embark on something like this at home. So for the time being I'm going to simply replace the hydraulic tensioner and re-install the intake manifold so I get the car started and re-assess at that point. Although while I have the tensioner out I will take the opportunity to see if I can use an endoscope to assess the condition of the timing chain cassette.
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