What does this webpage say about your location? http://whatismyipaddress.com/ Under the map, look for Location not accurate?

Probably where the ISP such as Sky broadband is based

Two methods are used to determine "location".

One is via the IP Address that your ISP assigns to your internet connection; known to vary widely in rural areas and with some broadband services even in metropolitan areas.

The other is via "geo-location" via WiFi for where the WiFi hotspot eventually connects to the internet; can be spot-on accurate is the router has a direct connection or it can vary widely when the router connects to an intranet before connecting to the internet.