There is no point having Type45s, Astutes if they aren’t facilitating hard power. The UK either has a blue water navy, or resigns it’s seat at the security council and reverts to local and constabulary roles. But be prepared for what that reduced position will bring.
We are finally at the cusp of having real / credible kinetic threat and influence (although more USS America than Nimitz) but in true British style we will throw it all away.. plus the billions already spent because of foggy thinking and lack of political will.
I would go as far as to say that without the carriers the nuclear deterrent should also go, as its retention without a credible conventional threat is a dangerous and fundamentally exploitable position.