A united British, Canadian, Australian, and New Zealand navy

How large would a united UK, Canadian, Australian, and New Zealand navy need to be?

It might center on four or five fleet carriers and four or five large amphibious ships, but missions, basing, training, and command arrangements would determine the final force.

A united UK, Canadian, Australian, and New Zealand navy would still provide for its own maritime security rather than leave it to the United States. An opening scale might include roughly four or five fleet carriers and a similar number of large amphibious ships, with escorts and submarines beneath them. Combining budgets could support more capability, but it also raises questions about headquarters, training, basing, and national access to senior commands. The fleet's size would follow agreed missions and governance rather than simple addition of the four existing navies.