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Rick, perhaps what you are remembering is this, which I reprinted in the club magazine several years ago:
This is from the September 1953 edition of
The Austin Magazine and Advocate, the house organ (company magazine) of The Austin Motor Company.
With regard to the color Coronet Cream and its alleged connection to the coronation of HRH Queen Elizabeth II, I am researching. I have found a couple of books with references to it, and a registrar who swears to it, but so far no primary sources. (Just because the statement appears in a photo caption in the 1992 McLavin and Tipping book, or in the 2000 Anderson and Moment book, does not establish it as fact; they are not primary sources. Likewise, hearsay is not a primary source. So far, only folklore.)
Incidentally, there is no mention of any special car colors commemorating the Queen's coronation in any of the June-December 1953 editions of
The Austin Magazine. Pity. That would be a primary source. (The coronation was in June 1953.)
In any case, I'll post a follow up report here when I've followed my leads to their conclusions.