I am replacing some internal wall lights, the wiring simply emerges out of the plaster and is terminated with a terminal strip which is housed within the hollow of the old wall lights wall fixing. The problem is that the amou nt of wire sticking out of the wall is insufficient to connect to the new w all light and needs extending a few centimetres. This cannot be done within the new fitting which has a back plate with just a small hole to allow wir es to pass through, is it OK to hollow out some of the plaster to accommoda te the terminal block then cover it with the backplate of the light fitting or is there some better and critically legal method of doing this.
Richard