Fibre broadband not working

[Another+One]

The connection to WWW has failed today at my house though I have a dial tone on my hub connected telephone handsets. 
I've reset hub and fibre modem and restarted key devices connected to the hub. Hub and modem show the required green lights and
I can connect to the hub admin portal via WiFi using a browser but there's no connection to WWW - Speedtest by Ookla shows there's no connection.  I

phoned Sky and chatted to their new AI bot who after a series of questions promised to connect me to a human but then said 'glad it's all working now' and then cut me off. 

Other than going through the whole charade again can anyone offer a better route to a Sky operative or point me to an independent broadband service checker. 
thanks

[caesarome · Accepted solution]

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@Another+One wrote:

can anyone offer a better route to a Sky operative or point me to an independent broadband service checker. 
thanks

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Have you tried Sky's line test:

https://www.sky.com/help/articles/broadband-diagnostic-start

[Another+One]

Thanks, but yes I tried that first and it stated that there were no line problems in my area, that the connection to my house was good, and even that my wi-fi was working. 
The line started working a few hours later so I assume that something was reset somewhere.