Old thread but I had some useful input on this at Audi In The Park last weekend. 
Talking to someone with a D2 (not sure who, not a regular here, but uses our sponsors a fair bit if I'm recalling the right person) who said he solved his problem by sealing around the numberplate mounting panel.
He spent ages trying to trace the source of the leak and eventually worked out that rain was running down the back of the boot lid and in the top edge of the numberplate recess surround.
He just filled it all the way round with mastic - very neatly as I didn't even notice until he pointed it out - but I'd rather do it "properly".
Mine is still a bit of an annoyance. Anyone know how that area is dismantled so that it can be reseated and sealed correctly?
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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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