Sorry for the delay in posting.
The noise started around 50k ago and was intermitent but gradually over the years has become more regular..
Although when the engine is first started the tappety noise is not there untill it starts to warm up.
I intend to investigate when the weather gets a bit warmer I have more time on my hands now.
I did get a stethoscope and listen and I suspect it was noisier around the vacum pump area although there is such a clatter from this engine its hard to be sure.
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