The first question everybody asks me is,
"Why haven't you done anything about it before?" Well I tried!
Purchased in 1998, it's leaked from new.
It's only now that I've really started experimenting to discover the route
the water is taking. Frustratingly, it's been very easy.

Some of the water running down the windscreen on the passenger's side will
pass under the trim (skuttle panel) at the base of the windscreen.
Immediately below the skuttle panel is a splash guard preventing the water
from running into the intake for the ventilation system.
At the base of the intake is the ventilation fan, which is accessible from
the passenger footwell. Water drips into the intake filling the fan with
water, before it overflows and spills into the footwell!

The splash guard is attached to a lip that runs along the width of the car.
The splash guard rests below the lip except for two small raised edges that
slot above the lip so securing the splash guard to it. Water that's passed
under the skuttle panel runs off the top of the lip onto the splash guard.
However due to the capillarity properties of water, it is squeezed back
between the lower part of the lip and the splash guard.
The water then drips over the rear of the splash guard and into the air
intake. Bingo, wet feet!

What I find strange is that the lip has a raised edge to it, to form a
channel that water can run along, but only on the drivers side. This works
so well I can not understand why there is no raised edge on the passenger
side. Should there be a raised edge which in this instance was never welded
on?

The solution appears quite simple, use Duck tape or sealant, but what
bothers me is in all the garages I've been to none have experienced anything
similar.
Apologies for the essay
Suggestions please.
David