There are a number of different sources available that can provide you with details on mental health policy. Listed below are a few sites that we would recommend you try:
Department of Health
http://www.dh.gov.uk/MentalHealth
Mental health information from the government department responsible for health and social care
Mental Health Foundation
http://www.mentalhealth.org.uk
Carries out research, campaigns and works to improve services for anyone affected by mental health problems
Sainsbury Centre for Mental Health
http://www.scmh.org.uk
Carries out research, seeks to influence policy and works to improve services for anyone affected by mental health problems
Specialist Library Mental Health
http://www.library.nhs.uk/mentalhealth
Specialist information about mental health policy and current practice