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connect the wires, place in moisture resistant 'box', then press into the back of the wall box.
cut a rectangle of ply and 'interference fit' it into the box, a few mm below wall face. skim over, sand back, skim over again, sand and feather, prime and paint.
roughening and soaking the ply helps with adhesion of plaster
rive_gauche
chrisbmx116
Cheers buddy. Will look both those up. Will plaster over rather than blanking plate as the whole area is falling apart, I hear plaster = moisture = conductivity? Whats the fix?