Well, at the end of threading up this 1200 end warp on 24 shafts I have 4 extra ends.
I swear I individually counted off each bunch of 24 ends and yet I have extra ends.
I'm going to assume I put in an extra cross or two somewhere when I was making the warp on the stand, because that wouldn't really be much of a problem. The chance that I have on 4 occassions both missed a shaft in threading and also miscounted the same batch seems far fetched. Also, I didn't take as much care as usual in counting my crosses when I was making my warp, so that's probably where I made my mistake.
Also, this is a Texel loom, from France. I've never used one of these before, I gather the programming box is somewhat arcane. But they really are beautiful machines. Some people moan about them, but I suspect they just haven't given them the time needed.
A little bit awkward to thread through, but I think I've got the hang of it now, you just have to sit side on so as you don't end up having to crouch to get your arm to the back.