We are in the kitchen of Le Petit Trianon. This is where they cook Her Majesty’s food.
I don’t know if you can see the marks on the cieling above the kitchen table, but there used to be a hole through which a small round table could travel upstairs without any annoying room service coming along with the food. Here is a close-up.
In the room next door, the machinery is still in place to lift the mirror windows for further privacy: not even the nosy gardener will learn who is dining with the Queen tonight.
And this is a particularly private spot; unfortunately I cannot show you the inside; I have to describe that a small discrete door in the panel opens from the hallway; so that we could pick up Her Majesty’s potty.