The geographic location attributed to a particular IP address isn't determined by GPS or map coordinates, it is a best guess based on what other observations have been made about that address. For instance Google record WiFi SIDs as they map areas with their cars, and then associate those with the physical location they were recorded. By cross referencing lots of sources of data, they can often get quite accurate - although at other times even the country is wrong (usually by using old data).
In the case of your IP being in Hartlepool, I imagine that is where the block of addresses containing yours has been recorded - probably a datacentre where your connection joins the internet.
