Related Rule
United Kingdom of Great Britain and Northern Ireland
Practice Relating to Rule 107. Spies
Section A. Definition of spies
The UK LOAC Pamphlet (1981) defines spies as “persons who, acting clandestinely or on false pretences, gather information in the territory of a belligerent with intent to communicate it to the enemy”. 
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 3, p. 9, § 6.
The UK LOAC Manual (2004) defines a spy as a “person who, acting clandestinely or on false pretences obtains or endeavours to obtain information in territory controlled by an adverse party, with the intention of communicating it to the opposing party”. 
United Kingdom, The Manual of the Law of Armed Conflict, Ministry of Defence, 1 July 2004, § 4.9.1.