I had a leak in my Vectra last August which was correctly diagnosed on this forum as a blocked water drainer next to the air con intake which meant water was spilling into the car through the air duct. I removed the black rubber part that was blocked so it wouldn't happen again.

I have just found water again in passenger foot well, not as bad as last time. Any ideas where this can be coming from?

Checked air duct again and all is clear.

Thanks