The Southall And Brent REvisited Study (SABRE) is the largest tri-ethnic population-based cohort in the UK, involving nearly 5000 European, Indian Asian and African Caribbean men and women. The study originally focused on the causes of diabetes and disorders of the heart and circulation, broadening this focus to include cognitive function in the follow up stages. The participants were aged 40-69 when first studied in the two Southall and Brent studies between 1989 and 1991. Over 2008-2011 participants were followed up in a comprehensive combined morbidity and mortality study.