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In Great Britain, expired NI cards were sorted into one hundred separate groups corresponding to the final two numbers of the NI number and were posted to the individual insured person's NI account ( the RF1 ) by the corresponding one hundred ledger sections at the Records Branch of the Central Office of the Ministry of Pensions and National Insurance and its later incarnations-Ministry of Social Security, Department of Health and Social Security, Department of Social Security, Contributions Agency, etc.
These 100 sections dealt not only with the recording of NI contributions but with requests for information about qualifying contributions necessary to pay sickness, unemployment, widows and other benefits and also with any correspondence arising from those NI accounts and NI cards.
Within each of the 100 sections, NI numbers were allocated among 16 splits with one clerk administering each split.
To trace unknown NI numbers, a general index contained millions of small RF2 index slips, filed in order of surname and listing the name ( s ), date of birth and NI number for every person within the National Insurance scheme.

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