What's up with these European sirens I'm hearing?

[Teacake]

@Capt.Ridley_s_Shooting_Party

There’s also a siren on some British ambulances that interjects a burst of static (it’s supposedly easier to work out which direction the ambulance is coming from). IME, it’s pretty rare to hear it, though.

I guess that’s the “shish” after the “wow wow wow” in the Independent article I found. You hear it fairly often in London.