UPDATED: UK: PUBLIC ORDER: Association of Chief Police Officers, Association of Chief Police Officers in Scotland and National Policing Improvement Agency: Manual of Guidance on keeping the peace (pdf), see also: 2004-ACPO Manual of Guidance-Public
UPDATED: UK: PUBLIC ORDER: Association of Chief Police Officers, Association of Chief Police Officers in Scotland and National Policing Improvement Agency: Manual of Guidance on keeping the peace (pdf), see also: 2004-ACPO Manual of Guidance-Public Order: Standards, Tactics, Training (Restricted version, link, pdf) and Ministry of Justice: Prisons: Use of force training manual (pdf)