Netgear Orbi RBK50 vs Google WiFi (3 devices)

I wanted to add that the issue with Philips Hue was NOT connected directly to the Netgear Orbi setup.  After quite a bit of testing with the new setup (now 4 Google Wifi devices) I have identified the issue.  I use the EE 4G mobile/cell network in the UK for my broadband.  When setting up the Orbi as the Router it defaults to using the DNS of the ISP.  When I switched to using Google WiFi the Philips Hue Hub immediately connected to the Internet and all worked perfectly.  The Google WiFi defaults to using Google's own DNS servers.  As part of experimenting, within the Google WiFi app I selected to use the ISPs (EE's) DNS - the Hue Hub immediately disconnected from the Internet.  On selecting Google's DNS servers the Hue Hub immediately reconnected. It was as clean and repeatable as a mechanical switch.  

This information has helped others unable to get Phlips Hue working reliably whilst using the EE network and has been reported to both EE and Philips.