First, I wish to thank you for the invitation to your gathering. I'm certain you know how much the Lady Warrington and myself enjoy a hunt and the gatherings built around it. I will be pleased to join you and your guests on the day in question. Further, I would be honored if you allowed me to bring about two of my finest stallions - other than the one I will ride, of course. These two are from an Arabian family and are almost literally itching to be off on a hunt in such fertile lands as yours.
I also, unfortunately, will have to decline your invitation on behalf of the Lady Warrington. She will be otherwise occupied.
I will be glad to take up your invitation of lodging space. Please let me know if there will be room in the stables for the superfluous stallions.
God Save the King, Lord Valentine William Perceval Spencer Warrington, etc, etc.