Played on BeebEm. Apparently all the events are locked in every time you start a game: They are not randomized, but they change everytime you restart. I created a save state on this run so that I always get the same set of events. After that, it was just a matter of trial and error to figure out what items I needed for each trip. There's probably better routes, and better "sets of events", but this one was pretty good for me.