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I noticed these “nacelle” like protrusions on the first stage of Black Arrow while browsing Wikipedia. They look like they're spaced unequally but symmetrically in two sets of two around the first stage.

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I couldn't work out their purpose, they look like they could contain some sort of SRMs to aid with staging but they are facing the wrong direction. My next through was that they might be some sort of sensor (pressure, turbulence, etc) but I can’t find any definitive reference.

I also noticed similar protrusions on the Cyclone-4 first stage from a recent Parabolic Arc article:

enter image description here

Do these protrusions share the same purpose, and what is that purpose?

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You can see these in the diagram (from here): Back Arrow Schematic Diagram

Which clearly indicates that these are the 4 'siskin' separation (and ullage) motors.

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