According to www.QueenLive.ca
there is an almost complete "better source" for Oxford :
Recording length: 38 minutes (1 CD, incomplete)
Lineage: AUD > ? > CDR (x)
Procession, Father To Son, Son And Daughter, Ogre Battle, Hangman, Keep Yourself Alive, Liar, Jailhouse Rock medley [cut]
This is the best-sounding version of the Oxford audience tape, although it plays a semitone too fast. There are a couple cuts between songs, and the last few minutes of the tape are missing.
Well I got this "better source" , but my copy ends during Hangman. Does anybody have this longer version and wants to share it or trade it ?