The EU has financed a new project called HBB4ALL. This project builds on HbbTV, the major European standard for converged services, and looks at how HbbTV technology may be used to enhance access services on both the production and service sides. HbbTV provides a straightforward specification on how to combine broadcast and broadband content plus interactive applications. HbbTV 1.x devices are widely available in the market while HbbTV version 2.0 is currently under development. TV content can be enhanced by HbbTV applications with additional synchronised services in a personalised manner. For access services this opens an entirely new opportunity for users who may choose an access service delivered via their IP connection which then seamlessly integrates with the regular broadcast programme. This article will describe the improvements to existing access services and ways of addressing the key technical, organisational and legal obstacles to the sustainable take-up of these services throughout Europe. We will offer new insights, from the fields of human machine interaction and social innovation, which arise from the new interactive multimodal and multilanguage services which may be offered. This article will first describe the structure chosen for the project, with four pilots developed in parallel: subtitling, audio description, sign language and user interaction. Then it will describe the methodology and research approaches used for testing the new accessibility services.