Maybe the reason for returning to the UK in Sept27 is possibly that he was u/t at a ME FTS,possibly chopped,or maybe a family crisis so then returned to Africa,returning later to rejoin as an NCO(not having completed his probationary `commission`).
Philrigger- The service no. is given as 916680,not 96680;however , the date of issue may indicate a `window` where he may have returned again,by ship/air to UK and be on other manifests.He may then have gone off to an FTS and then to 242. The info in the Gazette states he was killed on active service,so he may have been returning,possibly injured,damaged,and lost fuel that way.
Another site gives the aircraft as a Mk2 Hurricane,not a Mk1(`sonsofdamien).
Possibly Christine remained in Africa at this time as well,maybe returning after the war.