From going boeing's link. It will be used by both countries.
...The UK will commence construction of its first SSN-AUKUS in Barrow-in-Furness, UK, as early as the late 2020s. The UK intends to deliver its first SSN-AUKUS to the UK Royal Navy in the late 2030s. Australia will begin building its first SSN-AUKUS in Adelaide, South Australia, by the end of this decade. Australia plans to deliver the first Australian-built SSN-AUKUS to the Royal Australian Navy in the early 2040s. Australia will begin enabling works this year at the future Submarine Construction Yard in Osborne, South Australia. As a trilateral endeavour, SSN-AUKUS provides maximum interoperability among AUKUS partners. It will elevate all three...