Following a tip-off from Zenopus I ordered a copy from Amazon which arrived today. It contains a high quality scan of (most of) the map & key for Ian Livingstone's first ever dungeon - The Inner Temple of the Golden Skeleton - one of the first ever non-US dungeons and designed from reading the rules (not by seeing someone else's module or playing in a dungeon descended from Blackmoor). There was a couple of low-quality images of this Ian's shared before. It's got an intriguing key which I previously decoded in a blogpost -
Golden Skeleton - though the new scan makes reading it rather easier. At first glance it all looks rather random, but I managed to make sense of most of it. For example deducing that the underlined numbers refer to a teleport. The sign "Tea & Buns this way" and the "Mad Hatter" in Room 19 by themselves don't make much sense, but together you realise there's a Mad Hatter's Tea Party in room 19 and you've got something playable. I still don't know what "SLEERT" in room 8 means though - suggestions welcome!