I've just spent the last several hours trying to run the repo update scripts. So far, I've only managed to get the smallest VL 6.0 repo updated. In the other areas, the scripts never complete.
Support have just emailed me to tell me that the ftp-osl server is having problems and rebooting at random intervals. They're working on the problem, but until they get it fixed, it looks as though none of the updates are going to go through. Since several of the areas are only partially processed, I don't want to risk propagating the updates.
I'll post again once I know the problem is solved.