The water is still getting into the boot lid somehow and I've no idea where. 
The grommet around the air pipe has now been sealed and anyway I haven't been driving anywhere in the rain for a while (surprisingly!). I put the 3 grommets along the bottom edge back at the same time though.
The boot lid was definitely dry the other day, yet when I opened it earlier today water came out, not masses, but some. Since I was certain it was dry it's been sitting out in the rain, but not moving.
As a short-term remedy I've taken the small rectangular grommet near the latch out again.
The only places I can think it's getting in is around the edges of the light cluster(s) or the numberplate surround, but there's hardly much water flowing round there even in heavy rain.
Any thoughts people?
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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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