Behaviour change can be individually managed. However, much of our behaviour is regulated within social relationships, obligations and identities. Understanding how people relate in small groups and designing groups to help people change their behaviour has proved to be effective, for example, in relation to weight loss, diabetes prevention, management of chronic illness and change in drug use (including opioid reduction for those with persistent pain). Not everyone has easy access to groups, especially those in remote areas or those who are socially isolated. This may be resolved by using virtual groups. These can facilitate advice, instruction and prescription, and provide the opportunity to share problems and successes with others facing similar challenges. The MCBC applies a new framework for the development of group-based interventions and is developing new approaches to the management and facilitation of virtual behaviour change groups.