@Boik Thanks for your patience guys, I got there in the end. After following all of the suggestions, and the video I still couldn't get to the bottom of it, so I did a factory reset and started...

@Boik Thanks for the advice guys. I should get time to look at this tomorrow, so will report back.

@Boik Ah, thanks, but VLAN isn't selected on the old router, and I tried it with the cloned MAC address out of desperation. It's really got me puzzled.

Bought an AX53 to replace my ISP supplied Nokia router. Tether app says everything is fine, all LEDs are green From the router diagnostics page I can ping and traceroute to any external address and...