Related Rule
United Kingdom of Great Britain and Northern Ireland
Practice Relating to Rule 24. Removal of Civilians and Civilian Objects from the Vicinity of Military Objectives
The UK LOAC Pamphlet (1981) provides: “Civilians should be removed from the vicinity of military objectives so far as possible.” 
United Kingdom, The Law of Armed Conflict, D/DAT/13/35/66, Army Code 71130 (Revised 1981), Ministry of Defence, prepared under the Direction of The Chief of the General Staff, 1981, Section 4, p. 14, § 4(d).
The UK LOAC Manual (2004) states: “Parties to a conflict are required, to the maximum extent feasible, to … endeavour to remove the civilian population, individual civilians and civilian objects under their control from the vicinity of military objectives”. 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, § 5.36.