From 1981: STAR WARS: THE EMPIRE STRIKES BACK MONTHLY issue 144, reprinting Starfire Rising from issue 54 of the US run.
This issue boasts another unique-to-the-UK cover. Curiously it also omits the issue number and hedges its bets over the month of publication, suggesting that the British Bullpen were having some production and scheduling issues around this time.
The main story is, as with the last issue, an old John Carter inventory story left on the shelf when Marvel lost the license and closed the title. Marvel tried to stockpile stand-by strips that could be slotted in at any time if a title looked like it would drop behind schedule... but these were often left unpublished when a title closed. This wasn't a problem when Marvel owned the character as the one-shot story would eventually see print in one of the 'spotlight' anthologies or - in the 1980s - in the pages of MARVEL FANFARE. But licensed books were more of a challenge. And Marvel's accountants demanded that everything paid for had to appear somewhere.
So the unpublished strip was rather crudely reworked into a STAR WARS two-parter. And it stood out a mile. I suspect sales, on both sides of the Atlantic, took a hit when casual browsers spotted that the main strip barely looked like a dispatch from the galaxy far, far away.
Marvel, of course, had previous form in this area: famously, an issue of the BATTLESTAR GALACTICA run reworked an unpublished TARZAN story... recasting Apollo in the role of the Lord of the Apes. And then there was Apeslayer....