Hi Lee. I looked into a post bound binder when I was doing My course last year. They were very good and it did mean that you can change the images in the book without difficulty. I'll have a look for the info and post it on here for you. The book I have just had done was by Albelli - I was very impressed with the quality and speed of getting it done And would definitely recommend it.
In the meantime have a look at this site - they have a sale on at the moment
http://www.photogether.co.uk/sale/Albums_Post_Bound/