There was another copy on eBay a couple of years ago. I wanted to buy it, but it sold for silly money... Glad to see you got hold of a copy!
The Royal Enfield WD/CO factory ledgers also contain the "destination address" of each motorcycle (e.g. Todmorden, Breedo, Leicester, Wilford, ...). Interesting to see that these "destination addresses" were all "M/C Depots"!