( they are for hard copy sign off sheets, they are going to have boxs to be filled in by hand and then sent out in the post with a scanned copy retained.
Idealy id like it to be a one page pdf with a sort of varable init that each times its printed changes to a new unique number.
Adobe reader has the capability to update the pages so that it'll reflect correctly based on the document structure. See the answer by hephaestus above for how to do this in Adobe.
Is there a way one can insert a variable into a pdf or In Design doc so that each time it's printed it will print a unique serial number onto that page?The page number format is specified by the /Page Labels entry in the Document Catalog.Many documents use specific page number formats within a document.The objective of this technique is to help users locate themselves in a document by ensuring that the page numbering displayed in the PDF viewer page controls has the same page numbering as the document.For example, Adobe Acrobat Pro and Reader display page numbers in the Page Navigation toolbar.