Significant progress today; it was warm and dry enough to pop out and sort out some wiring. 
Ran a 12V supply to the DVB-T tuner from the old analog one, sadly has to be with the ignition on, there's nothing that goes "live" at 12V when you just turn the RNS on; fixable with a relay I guess.
Slung the remote cable into the cabin out of the boot and in the NSR door, tuned in to Radio 4 (no reception on my driveway) and went for a local drive.
I was only 200 yards up the road, getting out of my little local valley and it started spluttering into life - Gardeners Question Time I think. 
Headed back downhill and off to the other side of the main big valley onto some flatter ground and it was getting much better so I switched to Radio 3 for something more soothing  though it really still wasn't listenable while moving due to breakups.
Stopped in a layby used by school buses and tried TV - that was actually working very well when parked (as was radio) and only about a mile from home so still quite a distance from the transmitter (Crystal Palace).
So, a bit more tidying up to do (still waiting for some bits to arrive) and lots of experimenting with the 4 onboard aerials to try. But the principle of using the existing aerial(s) with phantom power from the old tuner seems worth pursuing. 
These pictures (sorry about the reflection of my fingers) shows how a small increase in signal strength from moving out of the valley has given a huge increase in reception quality.
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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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