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Because its a landing light n they are two switches will the black and blue both be neutral cause the red is live ?

Whats a multi-meter and I can't take a picture I won't be there until tonight it's old wiring but if the red is live n the black is neutral that would make the blue earth n I've never seen a blue earth before

I'm trying to fit a new light on my landing n the three wires coming out if the ceiling rose are blue black n red which ones are which ??