Thanks Sean, I'm thinking of a couple of (hopefully neater) different ways of doing it, I'll post the outcome in my own thread when I get it done. In summary the options are:
A. Common to both. Run the video lead from behind the inner boot lid cover panel down one of the struts, cable tied to the existing tubes/cables. I've done this before when replacing a failed GPS aerial with a glass-mount one on the rear window (previous S8).
B. Run cable from the drainage channel area into the boot by one of two methods:
1. Feed through an existing grommet by making an additional hole and sealing carefully. My right-side grommet is partly split so needs repairing anyway.
2. Lift off the rubber seal around the boot rim and feed it up one side of the exposed metal ridge and down the other before pushing the seal back on. Cutting a small diagonal channel in the metal might be needed. I'm replacing my seal anyway so it has to come off.
My personal preference at present is option 2 as it keeps everything separate from the existing OEM grommets. The best "crossing point" is probably as high as possible, so on the "front" edge towards whichever side strut is used to route the cable out of the lid.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
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