Not just any biographer gets portrayed in a Netflix series. But Andrew Morton is no ordinary biographer.

Morton released “Diana: Her True Story” in 1992. The source of his blockbuster biography was the princess herself, a fact Morton only revealed after Diana’s death. The details of those melancholy interviews, recorded secretly on cassette tape, appeared in the fifth season of “The Crown.”

“In a funny kind of way, the actual buildup to the Diana book was more dramatic than they portrayed it,” Morton tells The Post. “We swept the room for bugs. There was a lot of counterintelligence work going on there.”

Morton is in New York for the launch of “Winston and the Windsors: How Churchill Shaped a Royal Dynasty,” his latest book on the royal family. As he marks the publication of his 25th biography, Morton is soft-spoken as he enters the grand library of the gilded-age clubhouse where he has just given a reading. It could be the memory of bugged rooms still stings.

“What a beautiful library. It’s almost as big as mine,” he says in his clipped Yorkshire English.

While “Winston and the Windsors” tracks the connection of Britain’s greatest prime minister to the lives of six monarchs, the conversation first turns to New York. Many fail to realize the English statesman was, in fact, half Brooklynite. Churchill’s mother, Jennie Jerome, was born in Cobble Hill in 1854. A “dollar princess,” she married into the British aristocracy and conferred a certain New-York toughness in her America-loving son.

“He’s got the English bulldog and the New York chutzpah,” says Morton. “And unlike many of those who’ve been born in palaces and in high places, he was pushy, he was shovy. He used his elbows to get where he wanted. He didn’t wait for the glittering prizes to fall into his lap. He opened them up, opened the wrapping, and consumed them.”

If New York was part inspiration, the city almost once did him in as well. In December 1931, just up Fifth Avenue from where Morton now spoke, at 76th Street, Churchill was struck down by an unemployed motorist from Yonkers. Churchill had exited a taxi in the middle of the street and forgotten to notice the flow of American........

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