Re: The UK is in the dark.
The problem in the UK (and maybe other countries too, so it's not unique) is that any technical resource, such as a sovereign digital cloud-type service is going to be controlled through the planning and commissioning process by numpties, voted into office based on their ability to coax their local electorate to vote for them to fix the pot holes, or to stop migrants crossing the Channel.
And this is borne out by the over-spending on matters such as the Covid pandemic, where the government of the time had no idea of what to do, and they spent and wasted countless billions on some of their cronies who set up brand new companies so they could wangle their way into being given massive contracts for products they knew nothing about.
And even in the private sector, the entire saga of Fujitsu providing the Horizon software to the UK Post Office and which was found to contain bugs in the coding that lead to over 900 (now mostly overturned) convictions, numerous bankruptcies and suicides of Postmasters who were lied to by "brown tongue" merchants who probably didn't know what they were doing (or if they did, they were allegedly just following orders from higher-ups). (And it now turns out that Fujitsu had a contract to fix and edit transactional records (aka bugs) or pay a £150 fine per instance, which the leaders of the Post Office said in court was NOT possible).
So, as much as operating a sovereign server warehouse would be a perfectly good idea, it's implementation and oversight by politicians who know bu55er all about IT, would make it yet another white elephant - and there are many other examples of IT in the UK that fails - the long awaited Emergency Services replacement communications platform is way behind schedule, as is the supposed upgrade of NHS systems, and don't even get me started on the Make Tax Digital "service" !