Genuine questions:

Is it commonplace for a bank to be a British Ltd, and are they part of a separate banking emergency fund to accommodate for that because they have a banking license?

Also where do I have to look to find a real world address for Focus FS Ltd (company behind Mondo)? Looked around the internet after finding nothing on monzo.com. I know startups do not list contact info these days, but whois info is also opaque. I'm asking this because they advertize themselves as a modern bank, but I cannot find a real world address after 5 minutes of searching.