I have set up the router exactly as specified, but it still claims that it is not connected to the Internet and indeed does not do so. I have given up and swapped the two routers over. This does work...

I bought the VR600 from Currys/PC World in the UK to use to extend the reach of my WiFi and replace a TP-Link Nano router that has insufficient throughput. The VR600 looked as if it were as suitable...