How many large amphibious ships would the Royal Navy need?

Should the Royal Navy buy two smaller LHDs or full-size Trieste-like ships to replace its older amphibious capability?

It should seek at least two full-size LHDs and preferably three, because they must replace several roles and operate as part of a wider carrier and support-ship system.

Two large Trieste-like LHDs are treated as the minimum replacement for the combined functions once associated with Albion, Bulwark, Ocean, and Argus. Three would provide a more resilient structure alongside the two Queen Elizabeth-class carriers, Bay-class ships, and future multi-role support vessels. The difficulty is that the requirement is not one platform but a system of ships, aircraft, landing craft, escorts, and support assets. Treasury debates often favor a single visible purchase, while the operational effect depends on funding every layer of that system.