Approximately 15 months after submittng FoI requests for the UK Railway's Barcoded Ticketing specifications, I've just managed to settle the appeal on the cases (on a Saturday of all days).
So, presenting for your reading enjoyment, some PDFs that the Government really didn't want me to get until the last minute: https://magicalcodewit.ch/rsp-specs/
@q I hope you don't mind, but I uploaded these to Scribd for good measure
https://www.scribd.com/document/1010042061/Interoperable-Barcode-Ticketing-Code-of-Practice
https://www.scribd.com/document/1010042060/Ticketing-Specification-Ticket-Version-05-02
https://www.scribd.com/document/1010042058/Barcode-Presentation-Key-Management-and-Data-Specification-Version-02-03
This was sitting in my queue since you shared originally, thanks for liberating this information!
210561 ✨ [Q]
R Tyler Croy 🦀