Conducted a large, cross-sectional survey of psychiatric disorder and treatment needs of sentenced prisoners in the UK and assessed the suitability and efficacy of therapeutic community (TC) treatment within prison. Following an interview and case note assessment of 1,769 men and 294 women, TC treatment was considered suitable for 5% of male Ss and 8% of female Ss. The most common diagnoses were substance abuse (77%) and personality disorder (47%). Results suggest that there is a need to expand TC treatment for offenders with mental disorders, both inside and outside prison. (Dutch abstract) (PsycINFO Database Record (c) 2017 APA, all rights reserved)