Very Interesting!
I've tried to research the value of the pound in 1979, and I find that it was around four dollars, meaning that the Futura was priced much higher in Britain than the Athena was in America - around $2200 for the Futura vs. $1500 introductory price for the Athena (quickly reduced to $1200, and later reduced again to $800). This was right around the time James Callaghan was replaced by Mrs. Thatcher as PM, so the change from Labour to Conservative was an interesting time for Britain - particularly economically, I should think.
The mention of a "free cabinet" for the Futura is intriguing - I don't know if that means a piece of furniture as the term means in America, or if it was what is called a "carrying case" in the States. You know the old joke about America and Britain - two great nations separated by a common language! ;-)
Thanks so much for posting this - it's information American readers could not get in any other way.
P.S.: Greg - that was a screaming deal; it's already gone and the page deleted. Grrh! I really needed a photo of that cabinet for the Singer Athena discussion group - it's the rare armoire cabinet.