Lay summary: The specific needs of people who are homeless and who are dependent on drugs and/or alcohol mean that they are at risk of being particularly negatively affected by Covid19. Not only might access to drugs, equipment, and services be different in the context of Covid19, but drug-related behaviours such as using different substances or modes of administration may change too. This could lead to serious health problems or even death. This project examines how one service in The Salvation Army has changed practices and services provided, in response to Covid19, for people that are dependent on drugs and/or alcohol. We will explore associated challenges, barriers, benefits, opportunities and any risks and draw out lessons to be learned for sustaining positive change and for required amendments to practice.