Rear heated window wire mystery!

[Nellieboy]

Hi, now the weather is cold I have noticed my rear heated screen isn't working. I removed the trim in the boot lid and found that there is no wire leading to the 3 wired connector on the screen!! It has worked in the past so i presume it has become disconnected when I previously replaced the wiper motor, however, I cannot find it ! I presume it comes into the boot space from the same hole as the centre brake light wire but I can't seem to find it there.

Can anyone advise where the feed wire should enter the boot so I know where to look? Any help appreciated