"The last time the UK declared war without first seeking advice from Parliament was in 1939 when the UK declared war against Germany. This declaration of war occurred before Parliament had the opportunity to provide input or approval. Since then, there have been significant developments in the process of seeking parliamentary approval for military action in the UK."
All I hear is "wElL TeChNiCaLlY tHeY hAvE xYz pOwEr", let's see it then, let's see them actually use it, by themselves, 0 input from parliament.