Thank you @alastairp for that informative reply.
It is the genres and tags for the release that I am mainly interested in.
I have already tried the browse query with inc=release-groups+artist-credits+media but other key information is also missing - track-position, track-length (unless they are well hidden - I looked in both the XML & JSON results)…
If the browse query is intended to be the deeper reaching function of the lookup query, it should be able to deliver the same data - or shouldn’t it?
I am struggling to understand the reasoning why the limit to lookup query is fixed at 25 - can someone enlighten me?
So, I have no choice but to implement it in the long format - at least for now…
Would it be practical to ask for a change so that the browse and lookup queries return the same data (including genres & tags), or limit/offset values added to the lookup query? Or both?