Nav wiring

Hi, have read all the threads about green connector in boot etc, and sure enough mine is not there. Does anyone know if its still possible that some of the loom might be lurking somewhere, ie from the aerial to backseat, or ICS to aerial?
Seems amazing they would bother to fit the aerial and not run the wiring up to it!
Wouldnt mind having a go at running loom from boot to ICS, but the roof lining scares me!
Anyone found any stray bits hiding anywhere, so i know where to search next?
Many thanks in advance.

You'll need to buy a complete sat nav loom. I did this for my 2002 166 as it didn't have the full sat nav loom. I do have the roof aerial but the wiring is only for a phone. Got mine loom from a scraped car. I also didn't use the roof aerial for the sat nav, I used a seperate aerial on the rear parcel that I brought off ebay(only about £10).