[stephend]

Mine definitely has a leak somewhere around the top of the windscreen. I haven't pinpointed it exactly, but I know there's corrosion. Once inside, the water runs down behind the A-pillar trims. At some point I plan to get the screen removed so I can sort it out properly.

Mine also had a leak where the A-pillar, toe-board/bulkhead and inner wing come together (there's a flange that catches all the spray coming off the tyre full-on). I recently welded that, and hoping the MoT man is satisfied with my welding.

The footwell vents are supplied from channels in the inner wing that get their air from the ends of the scuttle. They double as scuttle drains, but they're huge. They drain into the sills, by the way, and should drain out through the sill drain slots.