Thanks Wayno. The winding and spacing is exactly as normal, as the film is wound onto the normal backing paper. The only difference is the width of the film, so it's cropped for width. The Ilford 617 film is notionally rated at 400 iso, but it's fairly old - some bulk rolls I bought on ebay. I shot this at 100 iso and developed for 6 minutes in ID-11 1+1 at 20C, and it came out better than my earlier efforts at higher iso. I might try some more at slower iso, and also try developing with Microphen.
Cheers!