Charles Spencer appears to be taking a leaf out of the Meghan Markle playbook as he looks to expand revenue from his estate.

The 62-year-old British earl, younger brother of the late Princess Diana, has registered his Althorp brand for everything from honey and marmalade to tea, cheese, cider and wine.

The move comes as he continues to weather the fallout from the publication of his controversial Princess Diana memoir, Swan Song: Diana, My Sister.

Spencer hosted Prince Harry and Meghan, along with their children Lilibet and Archie, at his historic Althorp estate in Northamptonshire in July before they moved back to the UK permanently this month.

Former actress Meghan continues to build her ‘As ever’ lifestyle business around fruit spreads, marmalade, honey, wine and other products.

Intellectual Property Office records now show a wide range of food, drink and retail products connected with the Spencer name.

“First Spencer imitated Prince Harry with attacks on the royal family, and now he is doing a Meghan – and appears to be planning to make jam,” UK newspaper The Sun quotes a source as saying.

Spencer’s apparent lifestyle venture would have an unmistakably personal backdrop.

Althorp has been the Spencer family estate for centuries and is also where Princess Diana was laid to rest following her death aged 36 after a car crash in Paris in 1997.

Spencer is going through a turbulent time following the publication of his Swan Song memoir, which has generated a bitter public dispute over his account of Diana’s life and death.

Spencer made a swathe of damaging allegations about King Charles, including claiming the then-Prince of Wales sounded “giddily elated” following Diana’s death and later told him: “Rest assured, we’ll forget her soon enough”.

Buckingham Palace took the unusual step of publicly challenging his account.

The Sussexes stayed at Althorpe in July. Photo: The Sussexes

“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,” a palace statement said.

Spencer stood by his recollection and said he did not write the book as an attack on the King.

Broadcaster Piers Morgan is demanding Spencer “pulp” the memoir because it contains claims about him that are “all bulls–t”.

Morgan says his lawyers have sent letters to the Earl and his publisher, Penguin, threatening legal action if it remains in stores.

The former newspaper editor was angered by suggestions in the book that he was involved in a decision to print “stolen” images of Diana while he was editor of the Daily Mirror.

Morgan pointed out he did not start working at the newspaper until almost two years after the story in question was released.

He also disputes Earl Spencer’s recollection of a phone call the pair had, where the aristocrat revoked his invitation to Diana’s funeral. Earl Spencer claimed Morgan “snarled with annoyance”.

Spencer has apologised for the inaccuracy, but has resisted calls to recall his book.

Morgan is continuing his defamation action.

Diana’s former butler Paul Burrell, meanwhile, has challenged Spencer’s portrayal of his relationship with his sister during the final years of her life.

“They barely spoke. He was not part of her world,” Burrell said on Morgan’s panel show Piers Morgan Uncensored,  about the siblings’ relationship before Diana’s death.

“I’d think (Diana’s) last five years … are pretty vague in the book because (Charles) knows nothing about them,” Burrell said.

He also quoted Diana as saying: “My family only want me when they want the best seats in the best restaurants or want to sit in the Royal Box at Wimbledon”.