[Hanuman]

Ah hah. Penny drops- I put it down to the fog of jet lag when reading the initial post.

Just as the basic heads have a variety of applications, you’ll also find the same lifters used throughout, and across many models in the VAG group, and years. I’ve only had two problematic lifters across several engines, and each responded to a decent cleaning.
I vaguely recall using a syringe to flush a couple. When I costed up replacement of a full set, it wasn’t too bad (not completely eye watering) for a V8-32v, which actually uses many of the same bits as a twin cam golf!

Pete Reeve/quattrocorner might be able to give you more insight into what model it truly belongs to, if you don’t find any other identifying markings.