The Home Office has issued another guidance which details the specific registration sections, lays out who falls under which category (4C, 4F-4I), and confirms the fee schedule for each.
The link to the guidance can be found here -
https://www.gov.uk/government/publications/chapter-7a-registration-of-persons-born-before-1-july-2006-whose-parents-were-not-married-nationality-instructions
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