The elements that make up a National Insurance Number (NINO)

Tony Breyal made this Freedom of Information request to Department for Work and Pensions

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Dear Department for Work and Pensions,

Could you please provide the following information under the
Freedom of Information Act:

(1) Please can you confirm that the following is the only format that a National Insurance Number (NINO) can currently take: "XX YY YY YY X" where X is a character and Y is a number ?

(2) Are there any restrictions on the the values that each element within a NINO can take and if so what are these?

(3) A list of the two-letter combinations ever used as the first two characters in a NINO.

(4) A list of the letters that have ever been used as the final character in a NINO.

(5) Are there any plans to change the format of the NINO in the future?

(6) A list of the two-letter combinations scheduled to be used as
the first two characters of future NINOs.

(7) A list of the letters scheduled to be used as the final character of future NINOs.

(8) A list detailing the meaning of the different elements that make up a NINO.

(9) Do any of the characters in NINOs act as a check by which the validity of the NINO can be verified? If so, how is this achieved?

Yours faithfully,
Mr T. Breyal

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