Warren, I can't find much to help you except a possible lead on the Horner. In Memoirs of Francis Horner, Edinburgh, 1849, there is a reference to your letter on p. 244, but alas, not the content you wanted. Interestingly in the light of the film, Madness of King George (good characterization of Pitt and Fox), Horner says: "I am inclined to think that the king, if he does not die from bodily weakness, will recover his present madness;...I am all for the monarchy, ..." Good luck, Bill Campbell