I had a similar conundrum when my father died, a few years ago.
However, in my case the main emotional attachment to the car had been his, not mine, as I hardly ever drove it. Luckily my niece (his granddaughter) was in need of a similar car at the time and she ran it until it was pretty much worn out.
We have 2 cars (see signature) and the small one (Focus) is a handy local runabout, the S8 gets used for longer trips or when we need 2 at the same time (once or twice a week, but probably avoidable in all honesty).
So, consider two things:
1. Do you have a direct emotional attachment to the car having used it, or is that just a side-effect of other feelings?
2. Why not keep both, you can probably insure and maintain them both for not much more extra than the A8 petrol you'll save when you use it?
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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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