Separately, they are starting to run out of traditional Royal Dukedom titles to give away. They've potentially only got York, Edinburgh and Cambridge left for future use, unless they want to be more creative in future
Well they could reuse Clarence (I always thought that would have been a good one for Harry). Also they could potentially bring back extinct ones or those merged with the Crown: Hereford, Warwick, Exeter, Albany, Avondale, Aumale, Surrey, Cumberland, Ross