Comment by holowoodman

> I'm not sure if they still can do it, but the English made nuclear submarines.

Not really. The Polaris and Trident SLBM systems as well as the nukes they carry are US designs that the UK is allowed to use. And while their current PWR2 reactor is a British design, it is lacking. Therefore the next PWR3 design will be based on US S9G reactors.