This is a commmonly used and cited document setting out aspects of Home Office policy on health and Human Rights. There is a section on suicide risk and other relevant matters
Immigration Directorate's Instructions - Chapter 1, Section 10 - Human Rights
This Order clarifies the use of handcuffs on adult detainees subject to medical escorts.
Handcuffs cannot be used on children (ie under 18 years of age).
Detention service order 02/2007 - Use of handcuffs on medical escorts
From : World Health Organisation and Aerospace Medical Association ;