I somehow completely missed that this had made its way online. I wrote this history of Labyrinth for Empire a few years ago as part of a Jim Henson celebration. It was posted on the site in May this year, as part of a month of ’80s-themed features. The piece includes interviews with writer Terry Jones and artist Brian Froud. It also explains the thinking behind Davie Bowie’s rather revealing trousers…
http://www.empireonline.com/movies/features/labyrinth-movie-history/