Hi Dougie,
Thanks for coming back to us on this one. Without having an actual issue to look into things further, there isn't much we can do I'm afraid.
I've had a look at the Hub itself this end and it's showing online with successful connections. The power and signal levels are all in optimal range and there are no area faults. WiFi diagnostics also show devices connecting and all receiving a strong signal.
If you're not having issues with devices connecting, disconnections, slow speeds and everything is working fine then there is no need to run any diagnostic checks.
If you start to have issues though pop back and let us know so we can look in to things further for you.
Many thanks,