We bought a couple of standard door handles and locks on our last trip. I had info on the doors from Stefan and we picked up what we needed.
But of course, I ran into a snag. The screws that go through the door to attach the handles to each other are a smidgen too short. The size was the standard 90mm but it seems I need 95 or so. I'm not sure why, but I think our door is a little warped which probably added the extra width.
Finding longer screws for a Swedish door, especially here in the UK, has proved to be a challenge. However, I've talked to three unexpectedly helpful locksmiths in the London area, and one of them has ordered what we believe to be the right screws. Sooz will pick them up next week, and we'll mail them to Janne, who has offered to screw everything together properly.