The easy way it to fit something like a clock connection unit or a back box and blanking plate.
Any cables in the wall must be identified as being there. We are allowed vertical and horizontal paths to an electrical outlet be it a switch, socket, FCU or even a blanking plate but once these are removed you also need to remove the cables as in the future some one may drill into the wall without realising it is there.
I also have wall lights which I don't use left on the wall solely to identify where cables run. I have some spot lights with 0.58W LED bulbs in just to identify there are wires there the light is so weak really does no good.
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