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Where people get into trouble is copying over the existing wiring to the three plate design. You may just have power for the light there but if not you need to know which is the loop in, loop out and switch line, the colour of the wire will not make much sense and if they're not sheathed with the correct colours don't make any assumptions about blue being neutral.
Read up on wiring a three plate and label your existing wires once you've identified them.
Airhead
@andos
I want to install a 3 way ceiling rose and run three lights off it. Can I just replace the existing light thats there or do I need to do anything special? (Existing light is a rancid 6 spot LED thing on a metal rod)