You see, if you have said this -
"I am fitting an alarm in a house for a job and there is no near by power so i need to chase a twin and earth cable in to feed an alarm fused spur, I am aware of the routing of cables in prescribed zones and at no point on the cables run will it be out of a 'safe zone' the cable will be 1.0mm, the run will be 12 meters and the cable will be protected by a 6A over current device, it will be ran within thermal insulation for part of the run and grouped with other cables , does this cable require RCD protection?"
then you could have had a straight answer, you may have had a comment on your cable or over current protective divice too!