"Politics is show business for ugly people" "So this is how liberty dies, with thunderous applause. Goodbye Democracy, it's time for Socialism." "The problem with Socialism is that you eventually run out of other people's money." "If you're going to pretend you live on a different planet from the rest of us, we'd appreciate it if you'd stop breathing our air and eating our food." "Comic Clock Funk Mutt Yo" "The onion in the cake tastes mighty fine!"
Well, in all these years of buying records I never realised that the 'matrix code' on the vinyl itself would reveal the artist! I played the single last night and the song is "Laugh Or Cry" - the b-side to the single you linked to! It does sound like Bowie, makes sense with the Queen link I suppose.
Until your post I never heard about this mispress before. So I guess, the technician at the EMI pressing plant noticed his mistake very quickly and thus only a few copies were pressed. Maybe only a single one ;-) It's hard to tell how much it is worth, but for sure there are a few crazy collectors out there, DD and Queen as well...
What you've read "ΨILTF" is more probably "ΨJEFF", which is, besides "RUM RUNNER", stamped on all original UK Pressings of Planet Earth..
But I've got some more questions: What style or colours do the labels have? Plain black or yellow company labels or with "corporate design" of that time? Does the vinyl itself have a solid centre with a small hole or a push-out centre with 3 or 4 conjunctions to a larger hole? Does the release have a picture sleeve?