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The cavity is there to provide a gap and prevent damp from penetrating to the inside skin of the building, wall/brick ties have drips on them to allow the water condensate to reach the cavity tray at the bottom of the wall and drain through the open perps to the outside, its not there for any electricians to run cables in and compromise the drips on the ties.
Do a google search and you will find that cavity's are no longer filled with insulation, it was always a bad idea and many house's have been ruined by the practice.
Do a google search and you will find that cavity's are no longer filled with insulation, it was always a bad idea and many house's have been ruined by the practice.