Top end knock!

[Crc s3]

Just been informed by a friend my noise I previously posted about could be cams/valve problem, maybe wear on them. I was wondering if anyone had had this problem and most important of all if they've had the work done and how much?
2001 s3 amk
Thanks everyone

 

[badger5]

most likely is chain tensioner/chain.
rocker cover off and look