“Waging war: Parliament’s role and responsibility”. 貴族院 (イギリス). p. 7 (2006年7月26日). 2014年9月29日閲覧。 “The United Kingdom has made no declaration of war since that against Siam (modern Thailand) in 1942, and it is unlikely that there will ever be another.(英国は1942年にシャム、現在のタイ王国に対して行って以降一度も宣戦布告を行ったことはなく、また今後もおそらく行うことはない。”
The Contracting Powers recognize that hostilities between themselves must not commence without previous and explicit warning, in the form either of a reasoned declaration of war or of an ultimatum with conditional declaration of war.