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Old light switches wiring

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Hi All,
I have these old light switches.
I understand this yellow / blue is the old pre 1980 colour scheme.
Is it correct that:
1. YELLOW with a red sleeve is LIVE
2. BLUE with a red sleeve is NEUTRAL


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I have put everything together as it was. The ones with black insulation tape are the ones that use to be live I labelled them days before the problem occurred.
I checked each wire individually and they are holding firm, not loose. The downstairs light works, the upstairs one does not.
With a torch I checked for any extra wires in the boxes and pull cord switch (a hole where the single 1.5mil wire comes out) but there isn't anything else.


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