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Finally got round to scribbling it as it was the only way I could get my head around it. What I did originally was the top doodle. Which is why the light stayed on with the single pole switch off/open. When I closed that switch, it shorted the supply which is why the RCD tripped.
I then fixed it by changing it to the bottom doodle. An actual circuit that can be broken by the switch.
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stevo_com
http://www.lightwiring.co.uk/tag/ceiling-rose/