I want to put an additional 13amp socket in a bedroom (additional socket onto existing circuit so the new P regs don't apply). I want to put it into the boxing around the soil stack and run the cable up into the loft. The soil stack vents to the roof. Are there any other building regs or other issues which prevent me from doing this. (I'm paranoid about the vent pipe possibly carrying methane and live cables running within the same boxing)
Anyone have any thoughts about the possibility of the soil stack leaking enough methane to be a problem?