If it is your tappets I would get them changed, my d5 snapped a rocker and took the whole engine out it was on 193500 miles.
Not sure what year yours is but was told 06 and 56 plates there were a bad batch of lifters and rockers that went soft not sure how true it is but I have a 10 plate engine in mine now and it is very quiet compared to my old one.
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