Shiiiny! I basically stole
Mair's idea (and, er, her tape), and made my new (second hand) Brompton a lot more reflective. I didn't do it to the same painstaking completeness, but at least I should be less likely to be hit by morons in four-by-fours. The dynamo works now, too.
Shiny. Likes the folding bike, I does.