Thanks Alfie, I only specify that make/model because I came across a clip of someone testing one. It made THAT famous sound so that's the one I asked about, I know nothing about sirens other than that. I would imagine there was maybe a hodge podge of different types being used around the country at ...

Hi everyone, I've always been curious about the story behind these sirens, the sound of air-raids in WWII Britain. Do any of you know anything about it? Who commissioned them? Who designed them? What was the thought process behind choosing that particular sound for air-raid warnings? It's one of the...