You may have read that in DV brochures etc. or been told that the alarm is pre-installed.
Well all that seems to be pre-installed in my apartment are the cable pipes but no cables, in these pipes is a single wire to pull through the cables.
In the wardrobe of the main bedroom is a white plate on the side and behind this is a void with a pipe/ single wire and a mains supply.
However beaware that the mains supply consists of three wires black,blue and green and is
live as I discovered when I was looking for the pre-install cables when I put my hand in. I have since put a connecter block on the bare wires.
This could have been a child putting their hand in here and been fatal.
PS Natalie and Pepe from AEA were with me when I discovered this, I was showing them the pre-install is not quite what you would expect when I found the other live wires.