Quick question on cable safe zones. I realise that the cable must be in a safe zone 150mm or buried at least 50mm from the surface. I have a service void in my frame which has created a 40mm space at the bottom of the wall which when plasterboarded will be 55mm (ish) so would it be acceptable to run my cables in this area which would be behind the skirting board or do I need to run the cables as you would expect in line with the sockets? The service void is filled with 40mm rockwool so it would save me drilling all the studs and making a gap for the cables. This will only happen on an exterior wall of the timber frame. TIA