In reply to AJM:
When we did the skull, to try and save weight, I wrote the description on a bit of paper instead of carrying the guide book. We managed to do the first hard pitch of Hindenburg by mistake, which felt much harder than what we were expecting. Managed to make it fit the description. The 6a pitch on the skull was quite hard, but only for a couple of moves, and the top pitch was ace, but out of sight of the belayer. Loads of runners but very precarious in the groove. I haven't got round to doing lubyanka yet.