The reboot of the router will have given you a different public IP address (as it will have connected to a different modem bank somewhere - probably re-routing because the outage was specific to your normal connection).
Location from an IP address is an inexact science anyway, but is generally fairly close to your geographic location - depends on how accurate the config data for your connection route is)
If you use
www.iplocation.net/
...it will give you an element of information about your IP address, how you are connected, and where it thinks you are (which presumably will show York if you haven't reconnected)
(It is accurate for my connection)
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Location, Location, Location new