Cheers all,
I will check the rubber on the scraper. I replaced the drivers scraper a bit ago and that side doesn't leak, however, this side gets most of the weather. Might even turn the van round to see if that makes a difference.
I don't think there is a membrane in there. Heard of these but this was a non original door and I suppose I've just accepted the membrane not being there. I will check the speaker when I remove the door card.
I obviously hope it isn't the skylight. I'm not sure it is, as you can see the water running from behind the door card but il check that A pillar anyway. I have had slight doubts about the seal around the high top near the front window so worth a nosey.
Plenty to check when I next get chance. Here's hoping its a scraper!

Jon.
1982 Diesel hightop. 1Y engine. Still work in progress but running and taking us on holidays.