Harwich supplied the method while Jutland supplied the justification

Did Jutland create the Royal Navy's night-fighting program and drive the push for radar?

Jutland helped justify investment, but Harwich Force experience supplied the practical foundation on which the interwar capability was built.

Jutland reinforced awareness of what a trained night force might achieve against a less capable opponent. Harwich supplied the aggressive operational foundation, while Jutland's better-known night action gave the Navy a public and governmental justification for continued investment. Experience and training had already begun to shape the doctrine before radar arrived. Radar later strengthened that existing structure.