Yet again Samsung release beta for Korea and USA..... there is other markets and other people in the World who do want to enrol in the beta. Who make youtube videos. Same with Galxy watch 5 wear os beta..... never got that either. Updated members app looked everywhere..
I'm very annoyed also. You're not the only one and Shamsung software engineers should be ashamed of themselves .The UK should be on the 1st phase. There will be people who will always disagree tho. One UI 5.0 beta, the UK was one of the first to test.
Just have to wait and see if they add the UK. There's no rush as I'm sure your phone is still working It's released in phases to make the roll out smoother If everyone tried to download at the same time, you'd get lots of issue with people not getting the software properly