Connected to LAN1 is a Cat5 running to my BT TV box and it works just fine.
Connected to LAN2 is a Cat5 running upstairs to my Linksys EA6900 802.11ac router, everything else is connected to this wither over Wi-Fi or Cat5, and it works just fine
Could i replace the HH5 with an unlocked HG612 set up in Routing mode, with the BT TV on LAN1 and the Cat5 to the Linksys on LAN2.
Thus allowing me to ditch the HH5, everything stays connected via the EA6900 and therefore works.
At present having the firewall on the HH5 and the EA6900 is causing me some issues in accessing my NAS from outside the network, so would like to simplify the setup a bit.