RE: Warning on scuttle drain holes.
OK, so it's, what, only 1 month since I cleaned out my scuttles for the second time and I have found the passenger side one bunged up again!
I don't park under any nasty trees or such. Just very typical driveway/street/work car-park type locations.
Looks like the wipers push rain off the windscreen straight into that hole. So I guess there is quite a high flow through there. Just seemed to be sludge in the hole, just flocculated dirt, rather than decayed stuff.
You don't need to open the bonnet. Just stand around the passenger door and look forward under the bonnet edge. If there is a 'swimming pool' there, you can reach in and clean the hole out.