The Bunker Group
I agree, I think Astute will be the design reference boat, especially from a crewing point of view.It does seem to suggest a UK boat but I do wonder if the Barracuda is still in (it appears this will not be the case)
The opposition must be onboard..... or this would be a dead duck.
Quite a stunning decisions .... but it does mean moving to a proven boat if the Astute is to be the model employed.
From what I understand, Collins is 58 crew, the Attack class was to be 60, according to Wiki, Astute is 98 and Virginia is 135.
Too early to speculate of course, but if I had to make a prediction, the boats will be based on Astute, US reactor tech, US combat and weapons systems.