Be surprised if they were worth anything on eBay, if they are let me know as I have pretty much full books of EIC, PIR & continuation sheets! Might be able start a trend.
I just dumped a brand new pad of Kewteck PIRs ...found in the loft while digging out Christmas tree from under a five foot high pile of redundant Regs books & OSGs
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No references to anything 17th edition like " Additional protection to cables buried in walls less than 3 mtrs deep " or " Is the fuseboard made from chocolate " Etc.
But the latest PIR EICR have , in their 5 pages , references to the 17th ammendments ..............however ..... if the installation is a 16th edition one then ..thinking about it ....why not use a compatible certificate . I find I'm writing on most of mine ...."Installation is to the 16th edition of BS ....etc "