Earlier this month, I wrote to various departments in the Falkland Islands governnment. The tourist board said they'd love to help, but didn't have any data that they could give me. They also said that the minerals department would be the only people that might have the data, but that they didn't own the copyright, so they wouldn't be able to help either.
However, a week or two later I got an e-mail from the Government Land Surveyor, who asked if I could use some dxf data (exported from AutoCAD). He's since sent data covering the road network of the Islands, street-level data for Stanley (the capital) and locations of all the settlements.
The Stanley data is now imported, and can be viewed on the Osmarender layer on the slippy map the Mapnik layer doesn't show it yet)