Why does HMS Achilles's bridge look closer to an Arethusa-class arrangement than to the standard Leander design?
Short answerAchilles had a modified bridge, and visible changes are common as navies adapt successive ships within a large class.
NotesA viewer notices that Achilles's bridge resembles the Arethusa class more than the standard Leander arrangement. Achilles carried a modified bridge, and such variation is normal. Navies adapt ships as construction and service experience accumulate rather than freezing every member of a class to one drawing. The larger the class, the more likely individual ships are to embody visible changes.