This thesis is in two volumes. Volume one consists of the research component and the second represents the clinical work conducted onplacements within the NHS. Volume I consists of three papers. Paper one is a critical review of the current literature regarding instruments used to measure relationship quality between a spousal couple when one of the couple has a diagnosis of dementia. Paper two presents the construction and validation of a new measure: The Birmingham Relationship Continuity Measure (BRCM). The final paper of Volume I is an executive summary of the main research findings. Volume II includes five clinical practice reports. The first report presents the case of ‘Mia’, who was experiencing low mood. Mia’s problems were formulated from both a cognitive and psychodynamic framework. The second report is a single case experimental design, investigating the effectiveness of Cognitive Behavioral Therapy used with a 35 year old man experiencing Obsessive Compulsive Disorder. Report three is an evaluation of a Child and Adolescents Mental Health Services use of outcome measures. The service was evaluated inline with government policy and recommendations made as to how the service could improve the completion of the necessary outcome measures. The final written report is a case study of the work conducted with ‘Kate’ an older person with anxiety. The fifth clinical practice report is presented here in the form of an abstract, and describes the presentation of a commissioning report for a new service supporting parents with Learning Disabilities.