Our study details the creation of a series of national open source low-level geographical measures of accessibility to health-related features of the environment. There are three main domains across our indicators: retail services, health services and the physical environment. Using the network analysis process of Routino, this study analyzed postcode accessibility to retail and health services in the whole of Great Britain. The three domains combined to form an overall ‘Index of Accessibility to Healthy Choices’ which highlights access to ‘healthy’ areas. We find the most accessible healthy areas are concentrated in the periphery of the urban cores, whilst the least accessible healthy areas are located in the urban cores and the rural areas.