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Ok, I'll play.
You connected all the similar colours together instead of the correct wiring for a 3 plate where the switch line neutral is effectively a line conductor and should be sleeved to show that.
Airhead-
Bingo. Wasn't sleeved. And had sat for so long I totally forgot about it. As soon as I worked it out I remembered thinking back to myself 6 months ago saying "I need to remember this....".
I just went black to blue and red to brown. Was easily fixed, and thank fuck for the new CU unit we got a few months ago. However, note to self, test everything before putting the whole bedroom back together in case you need to go into the floor again.
stevo_com
Time for all the trades to roast the IT geek. We're planning to put a plaster ceiling rose up in the living room and because of the horror show of a hole left by the previous fitting, I wanted something more substantial to be able to screw into while the adhesive sets, and in case the adhesive fails. So I took up a couple of boards in the bedroom above and fitted a 1' x 1' x 2" slab of timber between the joists. I also then fitted a length of twin and earth so I could feed that through a smaller hole rather than having to pull EVERYTHING through the ceiling to connect up the light fitting. The size of hole needed for that is bigger than the footprint of the light fitting. You can see the timber through the massive existing hole. And the four small holes mark the corners of that, and subsequently show the inner edges of the two nearest joists. Will have plenty to screw into.
The flaming will come from when I wired it back up. The light being on in the photo was when the wall switch was set to off. Who wants to guess what I did wrong? Took much swearing and head scratching before I worked it out.