In 1785, the future George IV of the United Kingdom secretly married his longtime mistress, Maria Fitzherbert, the catholic widow of common birth. The marriage was mostly regarded as legally void and just became a footnote in his long list of failures. What if it had become a major public scandal before his father's first major bout of madness? The prince of Wales was not particularly clever and had an even worse relationship with his father than was traditional for the Hanoverians, so if there is any call for him being disinherited I can definitely see George III agreeing to it gladly. He had several younger sons, with the second and third eldest being at the least competent individuals, so the succession should not be that much of an issue. Does a tale along these lines already exist? Is this a viable train of thought? Would their eldest brother losing his place in the succession over in essence taking a dalliance too far affect how princes Frederick, William, Edward and the rest go about their own marriage prospects and liaisons with women? Would Frederick Augustus, the as far as I can tell reasonably dutiful but rather unremarkable military man, be a good prince regent? Would he marry differently and perhaps more happily were he the heir? Would a different prince regent change anything about the course of the coalition wars against the French Republic (inevitable with a post-American Revolution timeline, in my opinion)?