Rebuilding the Royal Navy Destroyer/Frigate fleet isn’t new.
- 8x Type 26
- 5x Type 31
- 5x Type 32
- 6x Type 45 (to be replaced by ?? Type 83)
Assuming the Type 45 is replaced 1 for 1 that is already 24.
The Type 32 has never received funding, though, it has spent the last several years on a wishlist without ever leaving the concept phase. If the government accepts it needs to be funded then that is a significant development.
Also I expect that the 24 figure doesn't include the Type 83 destroyer, as the Type 45 will likely remain in service until sometime in the 2040s.
Air launched nuclear weapons could probably be integrated to Typhoon and/or F-35B.
Unlikely. Typhoon is slated to be replaced by GCAP. By the time the bombs and warheads had been produced and the Typhoons had received necessary updates, they'd only have a few years left to go. They also lack stealth capabilities so would need long range standoff weapons, which are more expensive than gravity-drop bombs.
The F-35B's range is relatively limited and would struggle to get home safely, unless it used NATO bases close to the Russian border - which would be the first victims of attack in a conflict with Russia.
It's F-35A or bust. That would be better for the RAF and also allow the Navy to not have to share the F-35Bs.
If US warheads, does that serve UK interests? Or US interests? Not necessarily the same thing. Maybe the UK needs to dust off and modernise the plans for the WE.177.
It's early days, these decisions likely haven't been made yet.