Heater intake drain hole blockage

This is what happens if the drain at the bottom of the air intake in front of the windscreen gets blocked. Water collects and rusts the surrounding metal work. It could also rust downwards allowing water into the footwells. Fortunately i only discovered this when i removed the heater box to refurb it. Applied plenty of waxoyl to protect the repair.

Will make regular checks in future that the drain hole is not blocked again.