Research information about reunification in the UK is scarce. Based on a prospective study of 180 children returned to their parent(s) in six local authorities in England, this article examines the factors that contributed to return stability during a two-year follow-up. Statistical analyses using logistic regression showed that a change in family membership since the child had entered care, foster carer assistance with returns, adequate preparation for and support during reunification, parental motivation to care and the involvement of another agency or professional in monitoring children were all related to return stability. Previous physical abuse to the child and previous failed returns were associated with reunification breakdown. The breakdown rates for the returns in our local authorities varied widely, especially for older children. Given the contribution of purposeful social work to return stability—as evidenced by appropriate preparation, services and monitoring of children’s progress—local authorities need to develop clearer policies and practice advice on reunification for all children, whatever their legal status or age, backed up by appropriate resources.