Northumberland, Tyne & Wear NHS Foundation Trust has a wide range of free self-help booklets to download. Many are based on CBT (Cognitive Behavioural Therapy) based and cover everything from anxiety, self-harm and depression.
https://www.ntw.nhs.uk/pic/selfhelp/
Selection of free self-help booklets to download and audio relaxation techniques published by Manchester Mental Health & Social Care Trust. Their free self-help booklets are based on CBT (Cognitive Behavioural Therapy) and include sleep, self-esteem and physical activity and mood.
https://www.mhim.org.uk/resource_library.html
Moodjuice is a website designed produced by the NHS in Scotland, to help you think about emotional problems and how to work towards solving them. For people who are concerned about their mental health, carers and professionals.