For those of you who have a 147 with a factory fitted sunroof. I have had a problem with getting a very wet drivers footwell when it rained, this would only happen intermittently. I tried all sorts of investigation methods believing it was leaves blocking the drain around the bulk head of the engine bay, but to no avail.
Further investigation and much dismantling of the car I discovered it was the left hand drain hole in the sunroof, the rubber tube which took the rain water down to the main drain hole in the engine bay was blocked, forcing the water into the roof and down the door seal onto the floor in the footwell. I unblocked it by holding my pressure washing down the pipe.
Problem sorted, just thought I would let you all know for any future issues with F/F sunroofs.