That is for UI3....Android 11.
The UK does have betas, I have had the last three I think all on flagship Note devices. Depending on your operator just make sure that yours is unlocked, it should be anyway being dual sim as otherwise you would not be able to put a different operator sim in it and defeats the purpose of having dual sim right. If not unlocked then just request an unlock code from your operator, I'm pretty sure they have to give it to you. I'm on O2 and mine was Network Unlocked out the box.
You can download via the details above but I would just wait a little while and join the beta via this Members app. Keep in mind that if you use Good Lock that it will not work after the update AFAIK. I'm going to hold out until Good Lock is available for it as I use it extensively.
Hope this helps!