Self Help Guides produced by Northumberland, Tyne and Wear NHS Foundation Trust https://web.ntw.nhs.uk/selfhelp/  Titles cover a range of mental health issues.

Living Life to the Full provide lots of different online self-help courses that are highly recommended by mental health professionals, covering lots of different specific topics and groups, including helping you to tackle depression.

Moodgym is another online self-help program designed to help you prevent and manage symptoms of depression/anxiety. It's like an interactive, online self-help book which teaches skills based on cognitive behavioural therapy. 

This leaflet from the Department of Health can help you understand the different psychological therapies you may be offered to treat your depression. (We offer these therapies in some areas.)