Thank you so much for responding, I can see I wasn't clear in my first post.
The first issue is how it's displayed - I've seen a number of sites where it is displayed in a full page format, rather than the blog style layout - I simply want the questions all on one page, similar to this site http://www.glamairbrushtan.com/faq/. The layout on mine has them all on one page (where the expand/collapse works), and also on separate pages as posts. I can't change the page type that I can see anywhere to achieve this. I tried going through the instructions again and i can't see what I've done wrong. Not sure if this is a limitation of my theme?
the 404 error I am getting is when I use the breadcrumbs at the bottom of the page and click on home>FAQ, which should be the "main" FAQ page I think - I need to add this to my menu.
thanks again for looking at this for me! I've spent a couple of hours and can't figure it out, I'm sure it's a simple fix if I had more knowledge with wordpress.