Britain does not simply entrust its nuclear deterrent to the United States or any other single supplier. Components come from several places and are combined with British elements. International procurement is therefore part of the system. It does not by itself surrender national control of the overall deterrent.
Notable Point · 1:47:53-1:48:06
Component sourcing and control of Britain's deterrent
Britain draws deterrent components from several sources while retaining national components and refusing to base the capability on trust in any one ally.