Very understandable, I feel the same way but I'm also impatient
Xiaomi ships hardly any phones to my country
( the regular mi 11 released in China in December only came a few weeks ago and it's totally out of stock everywhere and the staff have no idea when they be getting more or how many )
There planning to sell the ultra eventually but only the 8/12/256GB version will come here from what I've read
I would rather have Chinese one for 12/512 and I got it for $1200 including shipping and customs which isn't too bad for a phone of this calibre......
I can understand your situation too. I am impatient as well, but as I know the U.K. release date I might as well wait. It also means that Xiaomi might have released a decent firmware update that fixes and improves the camera by then.