The UK and Germany have insane demand that's why stock is so bad, people can't get enough and they sell out the moment they come in, not to mention the crazy long backorder queues. The countries that have it in stock (like Romania) have less demand and probably don't ship internationally.
Somewhat correct - if you really want it, but really, you will find a way to ship it from Romania to the UK, or from Denmark, to the UK.
About the availability - it's terrible mismanagement from AMD - the less interesting parts Ryzen 5 and Ryzen 7 are available, and what people look for the Ryzen 9 is not.
They should shift the priority.
The market is flooded by the Ryzen 3000 series which no one sane should ever buy. Why didn't AMD forecast properly - terrible mismanagement.