One of those political signatures (top right) is a cut-off letter in William Pitt's handwriting that he sent from London on June 7, 1804 to a certain mysterious Miss Carter who was then at Fersfield, Diss, Norfolk.
When I checked a modern map of Norfolk, there is indeed a Fersfield Road just outside of Diss. So who was Miss Carter? Her name appears nowhere else in the life of William Pitt, and to my knowledge, he did not have any colleagues or affiliations with anyone by the name of Carter. The letter was postmarked soon after Pitt became First Lord of the Treasury for the second time.
I wonder what became of the rest of the letter? This is just another mystery in the life of William Pitt.