All resolved last week.
I got a cable CAT 5 (sorry Kash) installed between the 2 rooms. Bought a Netgear 900 wireless router for the lounge room to compliment my Netgear 600 modem wireless router in the Study. All works fine wired and wireless. I have 2 wireless SSID (4 with 5G) but my devices pick the best one and at least I know which one they chose and even change.
Thank you all