The 1970 British Cohort Study (BCS70) follows the lives of more than 17,000 people born in England, Scotland and Wales in a single week of 1970. The study covers various aspects of life, including health; physical, cognitive and social development; parenting; career paths; and economic circumstances. It also collects this information from a variety of sources, including clinical records, medical examinations, nutrition and activity diaries, parents, teachers and cohort members themselves. Findings from the study have been used to understand some of the most persistent challenges facing UK society, and have been a vital source of evidence on key policy areas such as social mobility, education, training and employment and economic insecurity. Study website: www.cls.ucl.ac.uk/cls-studies/1970-british-cohort-study