Book excerpt: 2021 marks the 40th anniversary of the Limehouse Declaration and the launch of the Social Democratic Party in the UK, which was later to merge and form the Liberal Democrats. To mark this important milestone, this book brings together prominent politicians from across the spectrum of social democracy to reflect on its history and the challenges it faces in the coming decades. With an introduction by Sir Vince Cable describing the current state of social democracy across the world, leading figures including Sarah Olney, Roger Liddle and Chris Huhne explore a wide range of contentious policy areas such as the economy, housing and globalisation. Together, they set out a vision for the country and for the Liberal Democrats that has social justice at its core.