That's not allowed. You can't just run buried cables in walls with no sign that they're there unless they're within 150mm of a corner.
Good summary here: https://flameport.com/wiring_regulations/BS7671_selected_subjects/zones_concealed_cables.cs4
It's been a long time since I ran cables, but I do remember that.
Good summary here: https://flameport.com/wiring_regulations/BS7671_selected_subjects/zones_concealed_cables.cs4
It's been a long time since I ran cables, but I do remember that.
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