It is important that the iterations of certain works come into the archive. A classic example is Izaak Walton’s “Lives”, which changed every five years. The changes are just as important as the final text that we now know and that is published. Indeed, nowadays many publishers will publish several iterations. In the process of establishing the regulations, it will be just as important on occasion to ensure that different iterations of the same work, even though they are substantially the same, remain in the national archive.