Why Australian submarine orders need not create another British yard

Could Australian submarine orders support a second British construction yard?

The boats are expected to be built in Australia, with British component work concentrated at Barrow, so the orders do not automatically support another UK hull-building yard.

Australian submarine orders are raised as a possible way to support another British yard. The expected division of work has Australia building the boats and Britain supplying components. Reactor-related work at Barrow is the British contribution identified in this exchange. The commercial value of an export relationship therefore does not automatically translate into demand for another complete-hull construction yard in Britain.