You also have to get one that is on the UK Z wave frequency, assuming of course that you have the UK version of the SmartThings hub.
Aeotec did make a UK version of the doorbell, but only sold it for a few months, and I don’t think you’ll be able to find one now unless it’s on eBay or someplace like that.
There are a couple of alternatives to consider. The Aeotec panic button is a single button key fob which can easily be wallmounted, and should work quite well as long as it is somewhat sheltered:
Also, both Ring and Skybell sell their video doorbells for the U.K. market. These cost more, but of course are offering many more features, most obviously the video, but also audio. And there is an official SmartThings integration.
There are also other button devices listed above that are available in the UK. Such as the fibaro button and the Nodon button Personally, I don’t find the aesthetics of those as good for a doorbell as the Aeon panic button, but different people like different things.