The Royal Navy considered Type 45 concepts across a broad range of hull lengths and selected the second-smallest option before modification. Type 26 likewise existed in roughly 140-, 150-, and 160-metre forms, with the British design growing toward 150 metres. Australia's Hunter class and the Canadian surface combatant grew beyond that point. This is normal requirements growth: once a hull is selected, additional systems, power, and internal capacity steadily consume margin and enlarge the ship.
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Type 26 and Type 45 grew from families of possible hull sizes
Alternative Type 45 and Type 26 hull lengths show how requirements expand a selected design during development.