Timing Chain advice

[YOLO]

Recently gave the car a once over and adjusted the valve clearances etc which quietened down the engine a lot, but now can here that the timing chain is quite noisy. Two things ive noticed with my S3 is its always had a slight rough idle,( been through the idle control valve , Air Mass etc ) and the other thing is when its put in service mode ( with a reader) the strobe light never sits steady, it bounces around a bit. Does this sound like a possible stretched timing chain ? or play in chain ?. Cars only done 35K.

Also if i do change chain , is there an upgrade or anything you guys would recommend while its in bits.

Cheers for any advice.