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Airhead-
Ta, but I meant the wrong one. I can't seem to visualise what I did without drawing it. Probably just as simple as it being wired straight to the mains. But then when the switch was set to "on", the RCD tripped.
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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.
stevo_com
Cheers. I'm mostly annoyed at the spark who replaced the CU and did the EICR. He had every fitting and socket off near enough. He should have sleeved it. In fact, the two black wires were screwed into one screw connector/terminal block thing. This is the second bodge of his. The pendant in my office wasn't even fixed to the ceiling, just held up by the wires.
I'll admit I kind of know why the fix worked, but I'm still struggling with how it didn't explode more when it was in the wrong configuration. I'll need to draw the circuit out when I can be arsed to see what was actually going on. Anyway, all wago'd up and the connection from the circuit to the length of T&E is in a choc box in the ceiling. I hope that wasn't a stupid thing to do.
The other bollox was finding the bastard roll of earth sleeve I bought months ago. Of course it was in the letter rack. But I didn't see that before emptying EVERY tool or shed related box in the house.