@BigRedMan With Virgin Media if your main Virgin router/modem is down there is no other way to connect to the internet and the behaviour you describe in your post is correct. IE: Deco network will...

@Sezza232 Assuming your Netcom "modem" is also a router you can connect this to your internet connection first turning off the wifi, then connect main Deco and to Netcom router and change main Deco...

@Stephen26 You cant, only thing to do is change main Deco to Access point mode to stop double NAT.

@HeavyBrew Yes, all Decos work together.

@ugscavcg assuming you have FTTC broadband and not full fibre? What settings have you used so far? Have you tried the Plusnet hub in router mode and changing the Deco to access point mode? Maybe try...

@David-TP Perfect, thank you.