Most European countries have enough space within the country to do that, and, for most things, except banking typically, hosting within the EU is enough, it doesn't have to be within your own country.
A "full function" one in/around London. And a "tickbox" one for multi-region requirements near Cardiff.
The tickbox one has constant capacity constraints and a large number of Azure services aren't in it, but if you need to tick the "two regions and in country" requirement, you kinda/sorta can.
Wdym bigger fish, nuclear war has started and I can’t upload my video of a mushroom cloud to Tiktok!
But considering what these sovereignty rules aim to achive, and as someone mentioned, that the problem may be due to companies relying on a single region provided by a hypersclaler due to data sovereignity rules.
Then redundancy has to be considered by both the company and the rulers.