IPSOS, if it's only when the air con is on, you have a blocked drian tube. The exits for these are located under the vehicle either side of the gearbox, they look like those old fashined tea towel holders, a bulbous rubber with a cross cut in to it. Give these a squeeze and see if any water comes out. If not, you will need to remove the side panels from the centre console and look down near the carpet for a concertinaed pipe, pull this off from the lower end and poke some net curtain wire down to clear any blackages, this can be done with the side panels still attached but it makes it more difficult