Hi kineticbuzz,
Thanks for your note. There isn’t a built in way to restrict the location search, although you might be able to customize one if you are willing to dive into the code.
Also, although the location search itself is not limited, your map view will zoom into one country if all your events take place there. So if your events are scattered around the UK, the map view initial load will be just UK with the events plotted, and users can search by location from there. You can also limit the New Event page to only show one country as an option under Venue, if you only have events in one country and want to streamline event creation.
I hope the above is at least of some help. Let me know if I can do anything further.
Best,
Leah