I hope I have this right these cables are still connected tom the fuse box/ consumer unit and are live! if so. If you are not removing the cables that are inside the back box, the cables must be terminated within the box and a blank plate put other the front where the switch plate was. It is important that the area the cable runs if still live are identified so by place a blank on it it will make you and others aware of the danger. You can not just joint up and plaster over.
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