Mood-juice self-help guide and workbook for dealing with bereavement:
Mood-juice bereavement self help
Youngmind information and help for dealing with bereavement:
https://www.youngminds.org.uk/young-person/my-feelings/grief-and-loss/
The Good Grief Trust:
https://www.thegoodgrieftrust.org/find-support/for-young-people/