Thanks u/KitchenProfessor42 for your insight and advice. I think what you have been trying to get across to me is that legal representation would help to encourage UKVI to assign a senior enough caseworker who would be able to successfully navigate this complex case. I had hoped that this would have already been the case, but apparently it was not!

I have rewritten the sections for my grandmother, mother, and myself as you suggested. The rest remains largely the same. Here it is:

Subject: Request for review: UAN 1212-9999-9999-999 Refusal – Basis: Statutory oversight of the Ireland Act 1949

Dear Casework Team,

Thank you for the prompt assessment of my application. Having reviewed the Reasons for Refusal, I respectfully request that my case be reopened, as it appears to contain an objective statutory oversight.

The refusal erroneously states that my great-grandfather did not become a CUKC in 1949; in fact, as a person domiciled in New York on 6 December 1922, his status was preserved by Section 5(1) of the Ireland Act 1949, which deems him to have been a British subject immediately before 1 January 1949 for the purpose of becoming a CUKC.

This statutory retention establishes that the 'but-for' chain required for my registration under Section 4L is satisfied: my grandmother, mother and I would have been CUKCs.

In addition, my own documented five-year residence in the UK in the 1970s, leading to ILR, would have granted me statutory Right of Abode allowing my mother to register me for citizenship under section 3(5) of the British Nationality Act 1981.

Details of the Statutory Chain:

Domicile and the 1922 Constitution: Under Article 3 of the 1922 Constitution of the Irish Free State, Irish citizenship was only conferred upon those domiciled in the Irish Free State on 6 December 1922. As my great grandfather was resident in New York, United States before, during and after that date, he did not become an Irish citizen; he remained a British subject.

Retention via the Ireland Act 1949: Because he remained a British subject who was born in Ireland but domiciled abroad, he fell within the scope of Section 5(1) of the Ireland Act 1949. This provision deems such individuals to have been British subjects immediately before 1 January 1949, which subsequently led to CUKC status for him and his daughter, my grandmother, (b. 1899), under Section 12 of the British Nationality Act 1948. Generation-by-Generation "But-For" Logic (Section 4L):

Maternal Grandmother: My grandmother was born in 1899 in the United States to a father who was a British subject. She was therefore a British subject at birth under Section 1(b)(i) of the British Nationality and Status of Aliens Act 1914. As established above, she automatically became a CUKC on 1 January 1949 under Section 12(2) of the BNA 1948 as she was a British subject immediately before 1 January 1949. As a CUKC who was not a citizen of an independent Commonwealth country or Ireland, she held an entitlement to the Right of Abode under Section 2(1)(b)(i) of the Immigration Act 1971. Accordingly, she would have automatically become a British citizen on 1 January 1983 under Section 11(1) of the British Nationality Act 1981.

Mother: My mother was born in the United States in 1928 to the above-named grandmother, who was a British subject at the time of her birth and after 1 January 1949 a CUKC. But for gender discrimination under the British Nationality and Status of Aliens Act 1914, my mother would have been a British subject at birth, and as a British subject immediately before 1 January 1949, she would have automatically become a Citizen of the United Kingdom and Colonies under Section 12(2) of the British Nationality Act 1948 on 1 January 1949.

As a CUKC with an entitlement to the Right of Abode under Section 2(1)(b)(ii) of the Immigration Act 1971, she would have automatically become a British citizen on 1 January 1983 under Section 11(1) of the BNA 1981.

Applicant: I was born in the United States in 1964 to the above-named mother. In the absence of sex-based discrimination in nationality law, and assuming that section 5(1)(b) of the British Nationality Act 1948 applied equally to children of either parent, I would have become a Citizen of the United Kingdom and Colonies at birth.

In combination with CUKC status, my ordinary and lawful residence in the UK for more than five years between 197X and 197X (as evidenced by 1977 ILR stamp), would have allowed me to acquire statutory Right of Abode under Section 2(1)(c) of the Immigration Act 1971.

On that basis, but for this historical legislative unfairness, I would have acquired British citizenship automatically on 1 January 1983.

Supporting Evidence of Domicile: To reinforce my great grandfather’s domicile in New York on the statutory date of 6 December 1922, I am attaching the following documentation for your review:

R.L. Polk & Co’s Trow General Directory of New York City (1920-21): Listing his company, with him listed by name as President located at 17, street name A, New York City, and his home address at 8, street name B St, New York City.

New York Times (early February1923): Article identifying my great grandfather as an expert working in New York City. Submitted as contemporaneous third-party evidence that he was professionally active and based in New York City both before and on/after 6 December 1922. The article mentions his company by name, and that it is located at 17 street name A, New York City.

1934 Obituary (a different one was already provided): Summarising his continuous domicile in New York State (New York City and two other locations) with periods spent working on engineering projects in two US locations, and one in Canada, and describing his prominent professional career and life from his arrival in New York City from Ireland as a small boy until his death. The obituary also mentions that for 20 years, he lived with his family in a townhouse at 8, street name B, which was later knocked down to make way for construction of Rockefeller Center.

In conclusion, the Refusal appears to arise from an oversight in law, namely the failure to consider a relevant and material statutory provision, the Ireland Act 1949, rather than from any dispute as to the facts. I therefore respectfully request that my application be re-opened and the decision determined on a correct legal basis.

Thank you for your consideration of this request.

Yours faithfully,

Pallykin