As a preliminary step I've made a PDF of the book, which is now on my site. The formatting could do with more work - at the moment the columns are a little uneven on many pages - but I'd prefer to do that sort of thing in the final document. I also need to sort out page numbers and links from the contents page; again, I'd prefer to do that in the final document.
Having said that, I think I've caught most mistakes, but I'd be grateful if people could take a look and see if they can find anything else wrong.
http://homepage.ntlworld.com/forgottenfutures/album/flatland_novel.pdf