My internet settings are stuck on Northern Ireland, how do I set them back to UK?

Until about a month ago my internet settings were set to UK, i.e when I visited the Yahoo home or Auto Trader it automatically gave England-Wales-Scotland searches. Now it is automatically going to NI pages. It is doing the same on my fiances laptop, it wouldn't be too much of a problem if it wasn't for the fact that we can't use autotrader or the friday ads properly. Does anyone know how to change my settings back to UK?
 
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