I already pointed that out
Branchq, I am not wrong. You clearly know an awful lot about royalty, and I really enjoy your posts, but you're wrong on this one, as a very quick check of any official document will bear out. You may check the Court Circular, available in any good paper daily. The title is HRH the Duke of York and only that, because a *royal* dukedom, which carries with it a Princely dignity, is higher than merely being a Prince of the United Kingdom; the Princess Royal is a higher title than The Princess Anne, and so forth.
Here is today's Court Circular:
http://www.timesonline.co.uk/article/0,,61-1709503_2,00.html
And here is the official website of Buckingham Palace: go to the drop down menu on 'choose a member of the Royal Family'. The correct and official titles are given there:
http://www.royal.gov.uk/output/Page7.asp
There is no HRH The Prince Andrew, Duke of York because there is no such title. There is only HRH The Duke of York.
Now as to your confusion. You appear to think that I am saying that a divorced Princess or Duchess is still a Princess or a Duchess. I am not. I am pointing out to you that as a matter of law and custom, a divorced peeress who has not remarried may still use the style of address of a peeress. Emma, Duchess of Argyll and the Duchess of Argyll are still
both correctly addressed as "Your Grace", even though the first is only a former or divorced duchess.
Now, the reason both Diana and Sarah are not correctly addressed as Your Royal Highness was that the Queen, as fount of honour, as is her right,
specifically barred them from using this royal designation.
But she did not specifically bar them from using the ordinary normal useage of a divorced peeress. Thus, they were entitled to use the highest form of address of the non-royal, lesser titles that attach to their former husbands. The Duke of Rothesay is a lesser title that attaches to the Princedom of Wales; HRH The Prince Charles did not become Duke of Rothesay upon birth but assumed it when he assumed the Princedom of Wales. just as he then also became Duke of Cornwall and many other things.
Diana was free to use the ordinary non-royal style of a divorced Duchess. Indeed that is *exactly* what happened to Wallis Simpson. The King as fount of honour decided she could not use the ordinary style of a Princess and Royal Duchess. Therefore, to her, the lesser and normal dignity of the lesser title of Duke applied. She was styled 'Your Grace' and her casket bears that out. To take away the right to an HRH does NOT take away the right to the lesser titles and dignity unless the monarch
specifically says so.
And - at the risk of repeating myself - although a former Duchess is not a Duchess, she is
still correctly styled Your Grace. A Royal Duchess is a Duchess, contrary to your assertion; she is also and first a Princess, and uses her Princely dignity first. But when that is not the case (as with Wallis) the lesser ducal dignity applies.