Red light on router

[Nevan1]

Hello

my internet was working fine but we had a problem with the TP link system that pipes a signal up to our office in the loft. I turned off the router to start from scratch and try pairing them all up again but when it came back on I got a red light and no internet. I've done tests on the My Sky as per your instructions and it says the broadband is fine so I'm completely flummoxed 

[caesarome]

@Nevan1 

Try running the line test again:

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

You can also run the test via the MySky app on a mobile data connection.