Ok, so the car currently looks like this:

Since I bought the car there has been the tell tale smell of a leak in the car, the other day I noticed water dripping from the spare tyre well so pulled the spare wheel out to find a puddle of water. Initially I thought that the culprit was a hole on the boot floor, which I'm assuming should be plugged with something?

After having a search on ukmkiv's I stumbled across this thread:
http://uk-mkivs.net/forums/p/51109/392618.aspxI had a spare afternoon so decided to have a look at the vents mentioned in the thread, I whipped the rear lights out and the bumper off and had a poke around. It is worth noting that the rear light seals look pretty good, so I'm going to rule them out. The drivers side vent looked ok:

The passenger side looked a little worse:


I took the passenger one out, split the plastic bits apart and reattached the little flaps. Whilst it was out I had a look into the hole that the vent was fitted in and saw this



Anyway, put the vent back in:

And sealed both sides with a nice thick layer of silicone sealant:

We'll see how that holds up, I don't have a sunroof so that is ruled out, since I have dewipered the rear I have disconnected the hose for the washer from the water bottle so that cannot be the problem

I also suspect that the car has been rear ended on the passenger quarter sometime in the past, it all looks a little bit dented around the vent/under the rear light:



In comparison the drivers side is perfectly smooth
