To capture inequalities in mental and physical health and service use, we will be examining national population data from the 2007 and 2014 Adult Psychiatric Morbidity Survey (APMS); local data from the South East London Community Health (SELCoH) study provides local prospective population data from 1698 adults residing in 1075 randomly selected households (2008 to 2015); clinical data from Lambeth DataNet (LDN; 2004 onwards), a primary care database system containing clinical records on approximately 360,000 service users from all 52 GP practices in the southeast London Borough; and the Clinical Record Interactive Search (CRIS; 2007 onwards) system at the South London and Maudsley NHS Foundation Trust representing the largest mental health clinical informatics database.