Wifi says Connection Failed

[SchminaNina]

was watching TV when my Internet suddenly cut out. TV doesn't have Internet, it's dropped from my phone and not working on any device. 

Router is showing all green lights, but when I try to connect on my phone it says "connection failed". Have tried the check on Sky's website who say no issues with the connection (despite nothing currently being connected). Have restarted all devices but no success. Any ideas?

[caesarome]

Was it the broadband test here that you ran:

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

[SchminaNina]

Yes that's the one I ran. I did the general area check then clicked through to the one that says it'll test my actual connection