I knew when I typed, the "Duke of Wales" that it didn't sound right. I know that Edward (Mrs. Simpson's Edward) was the Prince Of Wales and he abdicated, I know that likewise, Charles also has the same title, (lapse of memory).

I couldn't remember how the Mrs. titles went.
I wasn't refering to any particular Duchess of Gloucester, just the "D of G" as a whole, but now that I think of it, I must have gotten this idea from Wills, (Shakespeare that is).