The articles just say sources and reports. There's not a single quote in the whole story. The number of people who know where a Trident submarine is at any one time, can be counted on one hand.
Astute and Trafalgar class submarines are not nuclear boats. They are hunter killer boats powered by nuclear but not carrying ballistic missiles.. SSNs as opposed to SSBNs. One of the Astute class is at sea trialling after repairs...