When we came back to here I brought a TP-Link wireless router with me. This is a 4 port plus WiFi unit that connects by ethernet cable. I plugged this into the award winning router and pushed all of our WiFi devices to connect to it rather than the award winning router our internet provider issued. This stayed working properly for 3 days.
Even if you get your award winning router working properly, running a separate WiFi access point is not a bad idea. I have one; all my personal devices connect the remote one while my TV, Smart Sockets and other IoT stuff connects directly to the broadband access point. This goes some way towards preventing a Sky box or 'smart' toaster getting access to the personal data on your phone.