It was one thing for us to decide to marry, but my husband is in the unusual position that he needs the permission of the monarch to wed, and although he informed the queen of our intentions right away, we needed to wait for the Privy Council to meet to have formal permission. We were then invited to go up into the eaves of the House of Lords to collect (and have explained to us) the document in which Her Majesty granted her “trusty and beloved cousin” permission to marry. It is quite something to realize that still today all Acts of Parliament, let alone matters such as members of her family’s wedding arrangements, are prepared on parchment by a dedicated calligrapher and then signed by the queen herself.
Found this rummaging through old posts. Proof that you don’t necessarily need to have written consent from the Queen or the Privy Council before you propose.