It's interesting how as through the generations the Windsor Accent has declined. With King George VI and his children (Elizabeth & Margaret) it was very pronounced. Then in the next generation (Charles, Anne, Andrew, Edward, Lady Sarah etc) the accent is still there but is softer and less pronounced. Then we come to William's generation (Zara, Peter, Beatrice etc) and the accent can hardly be heard. I think with George, Charlotte, Louis and their cousins the Windsor Accent will be non existant.