This new initiative from the Communication Trust looks excellent.
Communication Leaders is a peer-mentoring approach to supporting the language and communication development of primary and secondary pupils. It allows children and young people to take on a unique leadership role in communication within their schools and homes.
You can choose how to implement this approach in your school. You'll find everything you need in the link below, including a training session for staff to introduce the approach and resources to the chosen Communication Leaders, the resource packs, and a video showing staff and Communication Leaders talking about their experiences from the pilot project.