@duncanm93 To your first point. DO NOT rush out and send any off the BT equipment back to them yet, are you moving from BT of your own choice, or having forced migration to the newEE from BT? There are a few BT customers who have been extremely unhappy with the newEE router and its operation in comparison to there older BT hub, which is pretty damn good...
Unfortunately THE BT mesh disk are completely in-compatible with the new EE Superhub+, it has it's own designed mesh system and assume that you were not prepared to pay the extra to have it....
Mesh is not difficult, but it is all about wi-fi channels not clashing and co-operation between devices. Basic operation is to have the same ssid (wifi name) so as you move about your devices follow seamlessly around the network. Sticking to the same make help's with the ease of operation, unless you know what you are doing. I have EE router, Asus xt8 Router, RP-AX58 and Tp-Link Powerline with Wi-Fi all in mesh and transmitting wi-fi, but i have controlled the channel's especially in the 2.4ghz band, and they are all working fine with no issue. Replacement option depends on what type of service you have from EE regarding connection of the router device, so keep that in mind.
