Community Channel relaunched as Together TV in 2018. A free-to-air channel, Together TV has 10 million viewers (BARB 3 minute reach), and is supported by the UK broadcasters, media, and digital sector, who provide programming, bandwidth and cross-promotion. Diehl established the Social Founder Network in 2017, drawing on her own experiences of founding and running organisations with a social vision. An INSEAD Entrepreneur in Residence since 2006, and founding Advisory Board member of INSEAD’s ground-breaking Social Entrepreneurship Programme (in Fontainebleau and Singapore), Diehl founded the Social Founder Network with a vision to connect founders of charities and social enterprises in person and online, and to provide support and profile to social founders in order to grow their skills and impact. Diehl has played a major part in ensuring that the voluntary sector's voice was heard in mainstream public discourse on media policy. She was a founder member of Public Voice, the voluntary sector consortium that campaigned for citizens' interest in communications, successfully influencing the last two UK Communications Acts and the BBC Charter Renewal. Diehl published a chapter in the 2018 book, Communicating Causes (Routledge)