The fan has behaved very oddly over the weekend, sometimes working and sometimes not. And turning the speed up to max makes no difference at all, it just seems to decide to work, sometimes mid-journey 
Just been out to the car, it's pretty thick cloud at present, and the fan is just ticking over slowly driven by the solar panel.
IIRC that's driven directly with a relay that switches over to HVAC control/power when the ignition is on.
My thinking is that if it was the fan bearings or motor that are at fault then a low voltage input from the solar panel wouldn't make it work at all (and a high fan speed setting might prod it into life), so my suspicion still currently is focussed on the connector/wiring and some sort of poor/intermittent contact.
Currently awaiting some "bits" from A8parts that should assist with diagnosis. 
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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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