Hi Newbie here....
Had my defender a couple of weeks and 2 mornings after heavy rain both footwells are very wet....although no rust etc
The dash seems dry and the vent rubber seems ok.....Both doors are a bit rotten on the bottom...could water be somehow dripping downs door seals and getting into the
gaps seems a lot of water for that to happen..
Looked at the leak manual... ..fantastic.......................is the best thing to do sit in it while the wife sprays the windscreen with the hose for 5 minutes