The CD-Changer in my S-Type is in the boot on the left. It is blocking proper access to the "dust flaps" (seen here behind the aperture). Hence, I used a bit of wire (the arrow points at it) to guide a thin bit of electric cable past those dust flaps. A fairly thin cable does not disturb those dust flaps too much. If the cable is too thick, it holds the flaps open and you'd get more dust into the boot.