Rather than indulge in thread necromancy, and there appear to be a few threads on the subject of British Guiana, I will start a new thread, as I have a slightly different proposal.
British Guiana should be added as a section of Guyana in the same way as Demerara and Essequibo already is.
I have some earlier British Guyana notes to add, which I discovered researching St. Lucia improvers.
Exactly as for Zaire/Congo and other recurring requests, we consider better to not split issuers based on name changes or changes in the form of government; it is exactly like if you asked to separate France between kingdom, republic, empire etc… Or if you wanted us to separate “Great Socialist People's Libyan Arab Jamahiriya” from Libya.
Splits happen only when there is a significant change in territory and population (Cf USSR/Russia)
Статус изменён на Отклонено(Compendium, 27 Янв 2023, 23:12)
I would consider Zaire/Congo to be not comparable in this case.
Why is Demerara and Essequibo a separate sublisting? Your reasoning is not consistent. For consistency, I would argue that Demerara and Essequibo should by listed under Guyana if British Guiana is not to be given equivalent status to Demerara and Essequibo in the listing. The area of Demerara and Essequibo is located within what became Guyana.