Quick Q as I've never done this before just checking if my assumptions are correct.

I have 2 bookings, one return LHR-HKG, and one multi-city, HKG-ADL, MEL-HKG, on two separate bookings. Both of the HKG stopovers are around 24 hours (a bit more on the way to ADL, just about 24 hours on the way back to LHR).

I will have checked bags (including golf clubs) that I'd like to just check through to ADL and back to LHR on the way back. To do so, I assumed I just needed to let the ground attendant know when checking my bags in LHR / MEL.

I have read of "linking" my bookings, what does that achieve / do I need to do this? For reference, the classes are JJYJ on the flights. (I assume no, but for example would linking the two give me Business class amenities in MEL on the way back, e.g. lounge access) - I have no status.

Since I am "transiting" in HKG, I posted here, but let me know if this is the wrong thread.