Child and Adolescent Mental Health Services (CAMHS) are an NHS service that aims to help young people up to the age of 18 who are finding it hard to manage their emotional and psychological health, and who are suffering with acute, chronic and severe mental health problems.
NHS: Better Health, every mind matters
Looking after a child or young person's mental health
Ollee is a digital friend which aims to make a difference in children's emotional wellbeing. I haven't had a chance to look closely at this yet but it's worth you having a look.
Anna Freud: On my mind
Anna Freud: National Centre for Children and Families
Resources to Support Mental Health