Administrative Numbers
Reference numbers similar in format to NI numbers are sometimes allocated for tax or benefit purposes with special prefix letters. Special prefixes used in the past include the letters OO (for tax credit claims), CR (for investigations), FY (formerly for Attendance Allowance claims, named after the Fylde social security office where claims were processed), MW (used from 1980 to 1987 for migrant workers), NC (formerly for stakeholder pensions), PP (for use by pension schemes as PP999999P), and PY or PZ (both used for tax-only accounts created prior to 2003).
Read more about this topic: National Insurance Number
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“The principle of majority rule is the mildest form in which the force of numbers can be exercised. It is a pacific substitute for civil war in which the opposing armies are counted and the victory is awarded to the larger before any blood is shed. Except in the sacred tests of democracy and in the incantations of the orators, we hardly take the trouble to pretend that the rule of the majority is not at bottom a rule of force.”
—Walter Lippmann (1889–1974)