Here you will find all the documentation for our studies. This includes survey questionnaires, interviewer instructions, showcards, technical reports, survey reports, and derived variables. For more information, take a look at our guide to the different documentation types.
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User guides
NCDS Metabolomics User Guide
This User Guide relates exclusively to the metabolomics analysis that was conducted during the Age 62 Survey of the 1958 National Child Development Study. User guide published: June 2025
Date published: 30 June 2025
User guides
1970 British Cohort Study Age 51 Geographical Identifiers User Guide
A user guide which provides guidance and recommendations for using geographical identifiers in BCS70 Age 51 Sweep data.
Date published: 3 June 2025
Survey reports
Findings from the Early Life Cohort Feasibility Study small-scale field tests
This briefing outlines key findings from the small-scale field tests conducted as part of the Early Life Cohort Feasibility Study.
Date published: 23 April 2025
Survey reports
Findings from the Early Life Cohort Feasibility Study survey component
This briefing outlines key innovations and contributions the Early Life Cohort Feasibility Study survey component has made for data users and survey methodologists.
Date published: 4 April 2025
User guides
Social isolation variables in the British cohort studies user guide
A user guide which describes the social isolation data collected across five British cohort studies, and explains the harmonisation process. It summarises available variables at different life stages and offers practical guidance on using the data.
Date published: 10 March 2025
Technical reports
BCS70 Age 51 Sweep Technical Report Appendix
Appendices to BCS70 Age 51 Sweep Technical Report.
Date published: 6 March 2025
Technical reports
BCS70 Age 51 Sweep Technical Report
BCS70 Age 51 Sweep technical report from National Centre for Social Research.
Date published: 6 March 2025
Questionnaires and interviewer instructions
BCS70 Age 51 Main Stage Questionnaire
Complete questionnaire for the Age 51 Sweep (Sweep 11) of the 1970 British Cohort Study, including interviewer instructions and modifications by mode.
Date published: 28 February 2025
Questionnaires and interviewer instructions
BCS70 Age 51 Self-Completion Questionnaire
Paper questionnaire completed privately by participants for the Age 51 Sweep (Sweep 11) of the 1970 British Cohort Study.
Date published: 28 February 2025
User guides
BCS70 Age 51 User Guide
The comprehensive guide to the data from the Age 51 Sweep (Sweep 11) of the 1970 British Cohort Study, carried out in 2021-24 when participants were aged 51-53 years.
Date published: 28 February 2025
Centre for Longitudinal Studies
UCL Social Research Institute
20 Bedford Way
London WC1H 0AL
Email: clsdata@ucl.ac.uk
