If selling or buying, log into your account to have your selling item attached to your location or to see delivery info for your location.
Go to "Account Settings" (under your profile or account menu when you click very top left corner "Hi [name]!" a short drop-down menu appears).
Select "Addresses" and make sure your primary shipping/delivery address is correctly set to your UK home or preferred location.
You might well be asked to log in again in order to access anything under Account Settings even if you already seem to be logged in. I was when I tried this just now. It's an eBay security precaution.
You can't set UK as default for searches. I recall once that a post here explained that's because foreign sellers not just domestic ones can sponsor adverts so eBay understandably doesn't want to let you limit your search. I've also read a post here which suggested manually changing your seach to a distance of your location so as to limit searches to within these shores (roughly).
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