If you have renounced British citizenship, resumption of British citizenship might still be possible for you. You should seek legal advice so your circumstances can be assessed to see whether you can make the application to resume your lost British citizenship in one of the following ways:
Renouncing and Resuming British Citizenship

Renouncing and Resuming British Citizenship

Resumption as of Right

The British Nationality Act 1981 provides that resumption of British citizenship is permitted if “renunciation was necessary to enable the applicant to retain or acquire some other citizenship or nationality.” This is a matter of right and is available once only.

In majority of cases, people renounce citizenship because they want to hold a public office in another country or take part in politics there. These are not good reasons for the resumption of British citizenship as the applicant was not forced to give it up because he had to acquire another country’s citizenship.

In other words, if the other country of which you want to become a citizen does not bar dual citizenship, you will not be able resume your British citizenship as a matter of right because the renunciant is not acquiring or retaining the other *citizenship* through the act of renunciation.

Evidence

Applications under 13(1) should also be supported by a letter from the authorities of the country concerned (unless it is the UK or a British overseas territory) stating that the applicant’s renunciation of British citizenship was necessary in order to acquire or retain that country’s citizenship.

   


Registration After Renunciation of citizenship of U.K. and Colonies (CUKC).

Under section 10 of British Nationality Act 1981 you are entitled, on an application for registration as a British citizen, to be registered as such a citizen if immediately before commencement of the Act you would (had you applied for it) have been entitled under section 1(1) of the M1British Nationality Act 1964 (resumption of citizenship) to be registered as a citizen of the United Kingdom and Colonies by virtue of having an appropriate qualifying connection with the United Kingdom or F1. . . by virtue of having been married before commencement to a person who has, or would if living have, such a connection.

(2)On an application for registration as a British citizen made by a person of full capacity who had before commencement ceased to be a citizen of the United Kingdom and Colonies as a result of a declaration of renunciation, the Secretary of State may, if he thinks fit, cause that person to be registered as a British citizen if that person—

(a)has an appropriate qualifying connection with the United Kingdom; or

(b)F1. . . has been married to [F2, or has been the civil partner of,] a person who has, or would if living have, such a connection.

(3)A person shall not be entitled to registration under subsection (1) on more than one occasion.

(4)For the purposes of this section a person shall be taken to have an appropriate qualifying connection with the United Kingdom if he, his father or his father’s father—

(a)was born in the United Kingdom; or

(b)is or was a person naturalised in the United Kingdom; or

(c)was registered as a citizen of the United Kingdom and Colonies in the United Kingdom or in a country which at the time was mentioned in section 1(3) of the 1948 Act.

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