I have spent today adding in a patch panel after originally rejecting the idea. I decided to extend the network from my original run (living room to study) so a patch panel made sense. So, I now have my study connected, my lounge and today my spare room. I intend to add my kitchen next and then finally the rear bedroom.
I have found Roon much more stable since adding the network.
I am not sure though that I am connecting it all up correctly, I actually have good speeds, but need to think about whether its connected together as it should be. Currently its Fibre in>router (BT Smarthub with a single ethernet cable to the switch - all my other lounge stuff, ps4, amp all connects to this switch too)>Switch (lounge)>Patch panel (spare bedroom)>Switch (this has the Nuc attached and a Phillips Hue hub)>PC (study)/Spare room. I am not sure I am even doing a good job of describing it so apologies for any confusion.
Anyway, thanks again, I will keep updating as I add bits and if anyone has any useful network connection advice, thats much appreciated.