Why Britain pursued hydrogen-peroxide propulsion and very fast torpedoes

Why did Britain experiment with risky hydrogen-peroxide propulsion before and after Nautilus?

It offered very high underwater speed, matching a Royal Navy obsession born when German ships outran British torpedoes in World War I.

Hydrogen-peroxide propulsion was risky, but it promised the speed the Royal Navy wanted from underwater weapons and experimental submarines. The institutional appetite for speed is traced to World War I incidents in which German ships could outrun British torpedoes. That experience turned high torpedo speed into a persistent design priority. The later fielding of exceptionally fast British torpedoes is presented as the mature result of that long-running concern rather than an isolated Cold War choice.