Is there a fully worked-out plan for a British republic and its replacement head of state?
Short answerNo convincing complete plan; abolition would require a major settlement on executive powers, constitutional codification, devolution, and English government.
NotesNo republican proposal discussed here follows all of its consequences through. Transferring royal powers directly to the prime minister could make an already strong executive office still more powerful. Giving them to Parliament or a new president would instead trigger a contest over authority and democratic legitimacy. A replacement settlement would have to codify the constitution, define devolved powers, and decide whether England receives one government or several. Those choices would reopen funding, boundaries, and representation across the United Kingdom. The answer presents abolition as a major constitutional reconstruction rather than a change of title.