Related Rule
United Kingdom of Great Britain and Northern Ireland
Practice Relating to Rule 115. Disposal of the Dead
Section D. Burial in individual or collective graves
The UK Military Manual (1958) provides: “The belligerents must make provision for … interment, in individual graves so far as possible”. 
United Kingdom, The Law of War on Land being Part III of the Manual of Military Law, The War Office, HMSO, 1958, § 383.
The UK LOAC Manual (2004) states: “The remains of the dead are to be honourably interred (unless burial at sea is appropriate), in so far as possible in individual graves”. 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, § 7.35.