Related Rule
United Kingdom of Great Britain and Northern Ireland
Practice Relating to Rule 15. The Principle of Precautions in Attack
Section D. Information required for deciding upon precautions in attack
At the CDDH, the United Kingdom stated:
Military commanders and others responsible for planning, initiating or executing attacks necessarily had to reach decisions on the basis of their assessment of the information from all sources which was available to them at the relevant time. 
United Kingdom, Statement at the CDDH, Official Records, Vol. VI, CDDH/SR.41, 26 May 1977, p. 164, § 121.
Upon signing the 1977 Additional Protocol I, the United Kingdom stated:
Military commanders and others responsible for planning, deciding upon or executing attacks necessarily have to reach decisions on the basis of their assessment of the information from all sources which is available to them at the relevant time. 
United Kingdom, Declarations made upon signature of the 1977 Additional Protocol I, 12 December 1977, § d.
The United Kingdom repeated this statement upon ratification of the 1977 Additional Protocol I. 
United Kingdom, Reservations and declarations made upon ratification of the 1977 Additional Protocol I, 28 January 1998, § c.