The books have all been recommended by health professionals and have been tried and tested by people with experience of living with the conditions. The program is "endorsed by health professionals and supported by public libraries." They even provide a "core book list of accredited titles recommended by healthcare professionals that covers a range of common mental health conditions such as anxiety, depression, phobias and eating disorders."
The following video describes the Reading Well Books on Prescription program. Mind Over Mood appears at 31 seconds, 47 seconds, 2:09, and throughout.