Great, thanks for the suggestions, I'll try that... as to line justification, I found that if I did the whole page (obviously not just a line or two), and only changed it by 0.1 pt more, you can't really tell the difference, but it does mean doing it manually to a whole LOAD of pages, lol. The page justification function in Word does this automatically, but then I have to fix all the chapter endings (with section jumps and changing to normal page justif.). I hoped for a tool with enough intelligence to do the same as paragraph justification, which doesn't bugger up the last line!
My other solution is to mess about with, for example, the chapter heading spacing, since if I change it just slightly, sometimes it fixes the whole chapter (you know, one line jumping to the next page causing a domino effect).