Thanks for your reply. I stuck the nozzle of a handsoap pump down into the hole and got out a load of water, so it seems it isn't going anywhere. Not that I can see anyway. The inner part of the door frame seem dry. There a small gap (1 or 2 mm) in one or two places underneath the frame on the...
I've had problems with rain water accumulating in the frame of a door. From what I can see, there are drainage holes in the top of the frame, but none elsewhere to drain the water.
Sorry about the quality of the photos, but you can see that there's no drainage on the outside. I can...