From the NHS Evidence - mental health website:
This Department of Health [U.K.] guidance sets out some of the issues relating to the exchange of information between mental health trusts and outside organisations and individuals. It sets out when, why and how information can safely be exchanged for the benefit of the individual and the public.
To download the entire document, please click here (PDF).
Carers and confidentiality in mental health: Issues involved in information-sharing