I used to have the follwoing set up
Wall > BT Openreach Modem > Netgear D6200 > R1 > All Devices (wired).
Now I am aware the BT Openreach Modem has issues and causes lag spikes, so I got the BT Smart Hub so I could then be set up like;
Wall > BT Smart Hub > R1 > All Devices (wired).
LINK TO SMART HUB
Now even though the light on the hub is Blue, I can not connected to the web, I can access the R1?! - it kept saying - 'Can not connect to the DNS server'