Two steps forward, one step back!
Decided to at least have a "lash-up" before Saturday (ADI), so set to.
Video cable is plenty long enough and I have a ski hatch (now!). 
Already done some prep around the glovebox to give better cabling access (for TV and XCarlink) so decided to put the interface box in there temporarily.
It needs Earth, permanent 12v and ignition 12v. But I know from previous testing (for Digital TV) that the permanent 12v is only to keep some settings that are actually fine by default. So just switched 12v and earth should do.
The video cable has a power pass-through so I just connected that to the reversing light circuit in the boot lid (same as for the camera) and connected the other end to the interface box. For earth I just popped a lead onto the tag on the back of the RNS-D chassis.
And as soon as I selected reverse and pressed the radio/CD/TV button on the RNS-D , up popped the camera image. 
And I would have put that up here and gloated, except:
1. It was purple (well, magenta I guess) suggesting missing colours somehow. Tested with input from another known good camera and it was the same.
2. Assuming that was down to bad cable contacts I gave the various plugs a wiggle. No picture at all now. 
The reason was pretty obvious, there's a big multiplug into the interface box (the RGB output to the RNS) and I could see at least one wire had come off the pin.
Bit of a bummer, there are 11 pins and a total of 14 wires (some are combined) so a lot of identification, continuity testing and fixing to do. 
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant.
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". (Even rarer than a D2 S8!) 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. Agate Grey/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. Added Auto-dim mirror, Leather seats, 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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