I've actually solved this
For me I could not get a 10/100 or 10/100/1000 tp link to place nice (some people (including tado ) are reporting this works). I could not get error mesh to play nice. Virgin won't let you connect non Virgin modems. Arguably a hub 3 or 4 may work, but they are shutting down support for 3 and the 4 will follow at some point.
Then I tried a Wifi extender with a Ethernet port (another tado suggestion) - they can work in reverse - latch onto wifi and feed a network over cat cable to your tado internet bridge (the one I chose TP-Link TL-WA850RE N300Mbps). I'm no expert and it took 2 attempts - but after days of misery - it worked within 20 minutes. Of course some reviews of the TP link are not complimentary in that it hobbles wifi networks - but I'll leave that problem if I get it for another day