British Association for Counselling and Psychotherapy: For information about counselling and psychotherapy, and accreditation
http://www.bacp.co.uk/
The British Psychological Society: For information about psychology and accreditation
http://beta.bps.org.uk/
Royal College of Psychiatrists: For information about psychiatry in the UK and detailed information about mental disorders
http://www.rcpsych.ac.uk/default.aspx
For more information on how Systemic & Family Therapy can be helpful
www.aft.org.uk