WiFi slow

[ADT1]

We are paying for the fastest WiFi but the service is very slow can it be checked please 

[JimM1]

@ADT1 You can do that yourself, run the diagnostic service to check, if everything is fine run the extended check also!. No joy then you do need to call sky!

Try running the line test here to see if any faults are found:
https://www.sky.com/help/articles/broadband-diagnostic-start