Hi A7guy,
The ticking noise from the top left of your engine is very similar to mine. When I took it in it was the cam chain tensioner that needed fixing and they replaced all 6 cam shafts I think, I'll have to look at the receipt, I didn't really understand what was done so apologies if I got the cam shaft bit wrong. Anyway, the engine does sound better now, more of a grumble than a grumble with a ticking noise. Like you, the noise was there even when the engine was warm. What did it for me was that on trip I had stopped at a motorway stop and left my wife in the car with the engine running whilst I nipped out and when I was walking back I could the car idling in the carpark and I could hear the ticking noise, which I thought doesn't sound right. The main dealer fixed it fairly quickly with no fuss and cost about to them in parts alone was £3k add labour and a loan car for a week it must have set them back a bit more. Take your car in before the warranty expires. They must have come across it before because it was fixed, no questions asked. Mine is also a 2015 272 TDI with 23k on the clock at the time of the problem
I'll post a video of the engine post cam chain tensioner replacement when I get some time.
Hope this helps,
Kind regards,
v