This website includes a range of resources to get young people talking about mental health. There are those designed for school assemblies, short activities and lesson and session resources.
The assembly plans include PowerPoint presentations for 10min to 45 min time slots.
The short activities include group discussions and quizzes. These would work well with groups where able to have further discussions around the subject.
Lesson and Session resources includes interactive video, exercise sheets and PowerPoints. These sessions are designed for 6,10,20 and 25 min time slots.