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The house is pre 1900 & upstairs wiring is original as far as i know (rubber cable with red, black & other colour, wires are twisted) There are two switches in room for one light therefore a 2 way switch is required, what do you mean by a cpc or phase?

there is actual 2 way switching in room, all three wires go into original switch. no earth as far as i can tell

I AM TRYING TO REPLACE THE OLD CEILING SWITCH (2 WAY) WITH A NEW ONE, THE HOUSE IS STILL ON OLD TYPE WIRING, I HAVE A RED WIRE, A BLACK WIRE & EITHER GREEN OR YELLOW (NOT SURE WHICH) THE OLD SWITCH POSITIONS ARE NOT MARKED (COM,L1,L2) THE SWITCH IS AN OLD MK BROWN TYPE. CAN ANYONE TELL ME HOW...