This project used data from the British Household Panel Survey (BHPS) (held at the Archive under GN 33196), to compile a consolidated marital, cohabitation and fertility file, containing retrospective lifetime histories and subsequent panel data related to respondents' partnerships and childbearing. For the third edition (January 2011), updated data and documentation, covering BHPS waves up to 18, were deposited. The file includes variables covering childbirth, twins, unions (covering marriages and cohabitations), partners, and dates of separation or end of union.