My aircon was starting to smell and windows mist rapidly after running the aircon for a while and then turning it off, presumably this was the water collecting & rather than draining out under the car, re-evapourating into the air.
So today I put the car up on ramps to clean the drain tube after a lot of searching for pictures and the definitive answer as to the location of the aircon drain and not being able to find any, here's a few pics of mine.
Here's where it's located - looking towards the rear of the car behind & above the subframe.
Using a curtain wire to poke out the crud
Short video showing dribbling from drain here - http://s1085.photobu...5b796d.mp4.html
Hope this helps someone who needs to know where to find it