@TP-Link As I understand it the hub in modem mode (which it is) does not provide a wi-fi signal. As yet I haven't tried your suggestion -I guess that is the next thing to try.

In the office I have a Virgin hub 3 running in modem mode connected to a Deco M5 main hub. I have a switch running from one Ethernet port on the M5 to connect PC's etc.A second M5 is in the lounge to...