Interesting. I took the nearside drain out - easier to get at and as my drive has a slight slope it's the "downhill" one.
A good 700ml of slightly-coloured water came out of the condenser tray.
I then took the orange drain pipe indoors to inspect. It looked ok at first glance, but was definitely blocked.
The exit tip was clear, I'd trimmed it back a bit previously so the slots were open about 3mm anyway. I think the blockage was in the "horizontal" pipe section, it blew out very easily.
I collected the bits. It was plant debris, all quite small only 1mm or 2mm along/across. About half was unidentifiable black woody/seedy material and the rest was those blasted seeds!
It obviously settles in the tubes as water dribbles through and slowly builds up until blocked. I can't think of any obvious way to stop that so I guess it will just have to be a regular maintenance job.
Still need to work out how the excess water/debris arrives there though. 
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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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