Rather than create another post asking when the beta will be released in the UK/does anyone have the beta yet/ where can I find the beta, can I suggest searching the community for the word 'beta where you will probably find everything you want to know has already been asked.
Just did as you suggested, and the amount of posts asking about the oneUI 4 beta just goes to show how Samsung is failing in its communication department.
The beta is out in other regions already, and the said post from Samsung stated that its available also in the UK, which clearly isn't the case... hence the amount of posts / questions on the beta availability! People are starting to think that they are doing something wrong, hence not having the beta already, whilst it's really Samsung that's at fault for giving false/ premature information!
Up your game Samsung, and treat your customers with more respect.