Very helpful, Mike thank you very much for the expertise. I am treading very carefully with images, and as you suspected some of the best ones won't come cheap. I'm really quite shocked at first how much licensing fees are and by how many images publishers want for a non coffe table publication.
However, having gotten over my panic attack, I've been told, and the website seems to confirm this, that Getty has certain images that can be used for whatever reason the user likes so long as you attribute and send them a copy. SK Brown apparently also allows this, Mark used them for one of his books. Then there is British Library Flickr which seems again to indicate the above rules.
Added to that must definitely be an attempt to get hold of some of the images from ILN, and I've found some excellent things for sale on EBay to start with which should fit the bill nicely.
I also had the idea of creating a few images myself. Either copying some originals or painting some original scenes and scanning them. Never has it been an attractive thought to be held to ransom, by publishers or image banks! I'm also not above begging people for their own images... if anyone has a snap or engraving of HMS Euryalus or any of the aformentioned things, for instance you can have a copy of the book!
While you're on I was meaning to ask or message you about this project regarding a source you mentioned owning in another thread that spoke of the Royal Marines in Japan at this time, and during the engagement at Shimonoseki, I was wondering what it was?