Advances in digital technology have changed how media and news are created and experienced. Alongside this, there has been a growing recognition of the need to strengthen resilience to mis- and disinformation, acknowledging their potential to threaten democracy and children and young people's wellbeing. As their cognitive capacities are still developing, teenagers may have greater susceptibility to mis- and disinformation than older age groups while also having limited access to the learning experiences needed to develop the knowledge and skills to engage effectively with the media. The Behind the Headlines Media Literacy Ambassador project, run by the Guardian Foundation, aims to empower young people aged 14 to 18 with the knowledge, skills and confidence to critically analyse media and news and recognise mis- and disinformation. This evaluation of the project was conducted by the National Literacy Trust. The report focuses on data from 28 schools that took part in the project during 2023 and 2024 and includes findings from quizzes, surveys, youth panels and interviews with teachers. This is followed by reflections on what has been learned and how this might inform future iterations of the project and others working to support media and news literacy in young people. [This report was co-produced with The Guardian Foundation.]