Why not build an American or Italian LHD design for the Royal Navy?
Short answerAn Italian Trieste-derived design could provide the starting point, then be enlarged and adapted for Britain's wider operating conditions.
NotesForeign designs provide useful starting architectures that still require national adaptation. Trieste is tailored to Italian requirements and Mediterranean operations. A Royal Navy derivative would need greater size and changes for sustained work in the South Atlantic and High North. The lineage could remain visible, while the finished ship would follow British range, climate, and mission needs.