Thanks Dickloraine and Tex2002ans,
Much appreciated.
I'll avoid adding soft-hyphens after reading that article! Someone had warned me against using them, but didn't explain why, so thank you that's very helpful!
Yes I'm publishing it, I have people who have written reviews who are now tapping their feet, because I have been 'tweaking' it for several weeks now. I may have to outsource it if I can't get on top of it today!
So I'm grateful to everyone who has replied it's a big help
Zoe