INS and type 2 diabetes mellitus: The main aims of this study were to (1) determine the feasibility and acceptability of delivering the group DIME intervention for people with T2D starting insulin in South London, UK, and (2) to determine outcome data on glycaemic control and psychological outcomes, including insulin beliefs (measured using the Insulin Treatment appraisal Scale, ITAS), which may inform a sample size calculation for a future randomised controlled trial.