When Tom Bremridge became chief executive of the Macular Disease Society, he thought he was joining a relatively small self-help organisation. He certainly hadn't anticipated that, as potential successful treatments came on the horizon for this formerly untreatable form of blindness, he would find himself crossing swords with government departments, quangos and the medical establishment. He talks about what has been by turns an exciting, frustrating but ultimately satisfying experience. Plus, what is going on with the BBC iPlayer? The BBC's Head of Audience Experience and Usability, Jonathan Hassell, explains why the Real Audio stream has been switched off.