On September 30, 2026, Piers Morgan responded to a Times report that Earl Spencer, brother of Diana, Princess of Wales, had said he is not being sued over his new memoir. Quoting the paper on X, Morgan wrote:"Oh really… OK, well in light of this denial, I will now publish our legal correspondence."The Times attached that denial to Earl Spencer's appearance with Tina Brown at a New York book event on Tuesday, September 29, during promotion for Swan Song: Diana, My Sister. The newspaper's post said:"Princess Diana’s brother denies that he is being sued by Piers Morgan, who promised legal action over inaccurate claims in the book."That reply followed more than a week of argument around the memoir, which reached British shops on September 22, 2026. Piers Morgan first said on September 21 that he was taking legal action against Spencer and the publishers over what he called "demonstrable lies" about him. That evening, he expanded on the point on Piers Morgan Uncensored, reading from a section that placed him among those responsible for gym photographs of Diana published in 1993. The Sunday Mirror carried those pictures on November 7, 1993. Piers Morgan has said he was then on a showbiz column at The Sun and only moved to the Daily Mirror in October 1995. The same chapter said Morgan "snarled with annoyance" after Spencer rang tabloid editors in 1997 to withdraw their invitations to Diana's funeral.A statement put out for Spencer on September 22 accepted the dating error on the photographs and kept the description of the call. It said:"Earl Spencer's account of his conversation with Piers Morgan is accurate. Mr Morgan was surly and annoyed when Earl Spencer called personally to tell him that he was not welcome at his sister’s funeral."The statement then added:"As an historian, accuracy is important to Earl Spencer. He therefore wishes to clarify that his assumption was incorrect. Earl Spencer apologises to Mr Morgan for this error."Morgan answered on X that afternoon:"Earl Spencer has apologised to me for his defamatory lies published in his new book, Swan Song, published today. But I am pursuing legal action against him and his publisher Penguin to have the lies removed, and damages paid to the King’s Trust."In a further post, he said Spencer's memory of the call was "deeply misleading," and that he had been:“neither surly nor annoyed, but instead, very respectful to him and his family, as I wrote in my diaries, The Insider.”Piers Morgan says the apology does not halt letters already sent to Earl Spencer and PenguinMorgan told ITV News Royal Editor Chris Ship that a public apology left the printed first edition untouched."I'm spitting blood about this. He’s made an egregious defamatory series of claims about me which had nothing to do with me. And all right, he's apologised, he’s admitted that he was wrong, but that’s not enough, I’m sorry."He said Schillings had been told to write to Spencer and Penguin "demanding they withdraw these now admitted false claims in the book about me." On Sky News he said money recovered would go to the King's Trust, adding:"The longer this book is on sale ... then the higher the damages will be and the more money that will go to the King’s Trust."On BBC Radio 4's PM he said:"The mere fact he has so speedily issued an apology should say it all… You’re a self proclaimed historian. Remove it immediately. And if that means you have to pulp your book, well that’s on you."The BBC said Penguin planned to change that point in later printings. PEOPLE reported the same correction for a second edition.Earl Spencer has called the mistake a "small error" that would be "put right in the second edition." On Lorraine on September 23, he said he was "very happy to acknowledge" it and that he was "not rattled." He has presented the book as a record of his sister’s life rather than a strike at the royal household. While talking to Tina Brown, he described Buckingham Palace's reaction to other passages, including his account of a call with the then Prince of Wales after Diana died, as "very aggressive." A palace spokesman had said:"While we do not comment on books as a matter of principle, His Majesty is mindful that the pain of fraternal grief can cloud reason, affect judgment and colour memory in ways others do not recognise, even many years after such a loss."By the time of Morgan’s September 30 post, the letters he mentioned had not yet appeared on his account. That morning he also pointed readers to a Piers Morgan Uncensored interview with Qatar's prime minister and to a new Football Uncensored episode.