To ask the Secretary of State for Work and Pensions what estimate he has made of the number of individuals who have been issued with (a) two, (b) three and (c) four or more national insurance numbers. (184799)

In 2007, there were 1,517 instances where an individual was found to be using more than one national insurance number (NINO). A further breakdown by number of NINOs used by an individual is not available.