Recently I wrote to Jarrold and Sons who printed the Project SWORD Annual in 1968. This is their reply:
Dear Mr Woods
Thank you for your email. Jarrold Printing did indeed print this title and many others for Century 21 Publishing but I am afraid that we no longer hold any paperwork about it.
I expect you know that Century 21 is now Anderson Entertainment.
I hope that you are more successful in finding information from other sources.
With best wishes
Jarrold & Sons Ltd