My S reg synergie has developed a serious water leakover the past year. The
drivers footwell fills up wth water in heavy rain whether the car is being
driven or it is parked. I have cleaned out the drain tubes from the
scuttle at the front of the windscreen as has my local - and usually very
competent garage. I have cleaned out the seals around the sun roofs and
stripped and repaced the motor on the sliding roof to ensure it closes
fully. Water still comes in. The water is very clean and ourdour free. It
can fill up to a depth 3 cm in heavy rain when parked!.

Any more ideas I can try before drying it out and giving up on it?