Hello! If you want to specifically target the UK you can go into Google Search Console and set that country as your target location. See full instructions here: https://support.google.com/webmasters/answer/62399
What's likely happening currently since you're on a .com domain is that Google has yet to associate your site with UK only. You'll notice that when you select the country in search tools and then run a broader search, nearly all the results will be directly UK affiliated. Triggering this from search console should help the process along if it's something you'd like to do. Cheers!