Thanks for the replies. I may try to do a sample document but at the moment trying to complete the thing I'm working on which I can't really share. The vertical alignment was definitely not justify. In a sense the question of why the leading was 64pt when I had a leading setting of 90% was the puzzle. The character tab on the right was showing 64pt and there was a huge gap between lines. I noticed that for some reason there was also a character style selected and when I reset this to no style, it seemed to correct itself. I'm not clear how this happened as I hadn't (intentionally) selected a character style. As you may guess I'm just finding my way with Affinity but the text and style arrangements seem very different to all other packages I've used (Quark, Indesign, pageplus).