Problem I'm having is the mortar turns to dust whenever a clip is hammered in to it and it just falls out, tried no more nails but that wont stick because of the dusty surface..
Thanks for the suggestions. Had slim success hammering into the brick but I hope between those and the few that are loosely held in the mortar the cables should be ok, will invest in some of those plugs anyway - hopefully I get time to redo it properly.
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