The ONS Longitudinal Study (LS) contains anonymised linked census and vital event data for one per cent of the population of England and Wales.

Event information includes births, deaths, widow(er)hoods, cancer registrations, migration, enlistments and entries to long-stay hospitals.

The LS sample originally included the 1971 Census of Population information, for people born on one of four selected dates of birth. These four dates were used to update the sample at the 1981, 1991 and 2001 Censuses and in routine event registrations.

New LS members enter the study through birth and immigration, and existing members leave through death and emigration.

More Source information to be found here ...