Hi - sorry for the delayed response. I did manage to get this leak sorted but I am not 100% on the solution. It could have been one of these 3 things: I took a look at the trim around the outside of the windscreen and the trim covering the roof pillars were put on before the windscreen scuttle, so this could have allowed the water to get in. So when installing the new windscreen, I ensured the installer put these on the right way around this time. Deep in the engine bay under the windscreen there is a big weld. The location of the weld pretty much lined up to where the water was coming in, so we applied a little sealant to this. I had a new windscreen fitted. The above 3 things were all done while replacing the windscreen, so I am not sure what element solved it but one of them certainly did. My guess is it was the windscreen, To echo what Paul H said, get your drainage holes checked out. If they fill with leaves and stuff the water will not flow through and it will eventially find it's way in somewhere! Hope this helps.