thanks. I'm looking at B&W speakers as well as my brother-in-law works for them and I'm trying to get a deal! for 1st floor speakers I can get access from the loft and add MDF backboxes but for the ground floor I'll need to cut a big square in the ceiling to add MDF backboxes and then patch up the repair. a pain but I didn't think of this early enough in the build when I was running the speaker cable.
interesting that you're only running a single speaker in the bedroom, I'm struggling to come to terms with running only a single speaker and not a stereo-in-a-single-speaker in the bathrooms! it's just too many channels and too high a cost to justify stereo in the bathrooms. but I think in the bedroom it's worth it.
I have a Unifi network so hopefully I won't have any issues with the audio server over that and I might simply run a 2.5mm cable from the PSUB to the network cabinet for reduced cost but I'll have a think about it.