Just a little update, if anyone is interested. Some progress, some confusion. 
The drive unit from Scott arrived OK but was no better (or different) than the one I already have, so I have returned it for now. Swapping is very easy.
Adrian subsequently supplied me a replacement CD created in a "subtly different"? way. And that works consistently, albeit with limited testing so far on a couple of short journeys. 
The CD's Adrian sent/gave me initially didn't seem to work and I've passed a couple to Scott who also seems to have problems with them.
Hopefully between them Scott and Adrian can help each other work out how to create reliable DX CD's and check drives are working OK for sale/exchange.
So my current conclusion is that the CD I bought from t'internet has degraded over time (6 months roughly) as it is now mostly unuseable. I know they don't last for ever, being laser-burn copies, but I'd expect at least a couple of years life, so I will be in contact with the seller for an exchange as he is still actively selling these.
Apart from that it's a bit confusing, but it appears Adrian "may" have had a temporary problem making 2012/13 DX backups at first, now resolved.
As for the drive in my RNS-D, the evidence now suggests that it "may" be OK, but I need to make a few longer journeys first to be certain. If it isn't I know that swapping it out is not difficult.
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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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