Is case anybody has been considering purchasing the banknote book (subscription or chapters), there is an offer on at the moment.
"You'll get immediate access to more than 285 chapters cram-packed with detailed information to better understand and enjoy your collection, while helping ensure the continued publication of this invaluable numismatic resource.
Enter the coupon code COVID19 to get 19% off all orders through the end of April 2020. This discount can be applied to individual chapters, subscriptions, and renewals, even if your subscription does not expire for a while."https://banknotebook.contentshelf.com/shop
If you are not familiar with the Banknote Book, you can download some items for free. For example, SCWPM 24th Edition Additions (located under the World tab).
I think think that the quality is much better than SCWPM, also I'm not sure if there will be any more editions of the SCWPM.
I hope that this is of use to somebody. Also, I hope that I haven't broken any rules by posting this. I have no link to the Banknote Book.