The end of the game subtly links it to the Silicon Dreams trilogy.
For a long time, the BBC version was known to have been coded, but it might not have been published after all. This version was finally recovered in 2019 from a test disk held in the archives at the Centre for Computing History.
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Don't think Knight Orc was ever actually released for the BBC Micro or Electron:
http://stardot.org.uk/forums/viewtopic.php?t=2344#p19923
The BBC Micro version of Knight Orc has finally been found... https://stardot.org.uk/forums/viewtopic.php?f=32&t=17952
Ported to Commodore Plus4 by a coder named Pigmy in 1991 from the C64. You can find it on Recall collection floppy #178 available in Commodore C16 / C116 / Plus 4 TOSEC.