branchg said:
It's an intention, not an order from The Queen. The only way Edward can become Duke of Edinburgh is for Charles (or William if he becomes King because his father had predeceased him) to create it again for him after the titles merge with the Crown.
Actually Edward could inherit the title directly IF and it is a HUGE IF:
Charles, William, Harry AND Andrew all predecease Philip and/or the Queen.
The title would then pass as follows:
IF the Charles, William, Harry and Andrew all die, then the Queen dies, Beatrice becomes Queen BUT Philip is still alive - then he dies, Edward inherits all of his father's titles as he is the eldest living male line descendent.
IF the Queen dies, followed by Charles, William, Harry and Andrew (in any order by the way) and Philip still lives the scenario is the same as above.
IF Philip dies, then Charles, William, Harry and Andrew (again in any order - the title passing from each person as those ahead of them die) then Edward inherits the Edinburgh title in his own right and then the Queen dies, Beatrice becomes Queen and the Edinburgh title still remains in its current creation.
The agreement was announced on Edward's wedding day that after both the Queen and Philip die Charles will create Edward Duke of Edinburgh - they aren't anticipating the above dreadful scenarios. Charles could go back on this agreement but considering the fact that it was announced in 1999 and is common knowledge I don't think that Charles would go against the expressed wishes of his parents.