I saw this book and just had to buy. It made me chuckle in the shop when I saw the wedding party all knitted up. The book is called "Knit your own Royal Wedding" and is by Fiona Goble. It includes patterns for the happy couple, the Queen, the Duke of Edinburgh, Prince Charles, Camilla, Prince Harry and the Archbishop of Canterbury. Oh and I forgot the corgis! Also included are various outfits for the guests and a make your own cardboard Palace balcony.
Best wishes to the bride and groom.