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“She remembered her parent’s marriage as being very unhappy.

Lots of rows, lots of shouting,” Morton explains in the documentary.

Princess Diana at an event

“She told me that on one occasion her father hit her mother.

It was a very disconcerting childhood for Diana.”

“At that time, that was a very unusual verdict,” Morton said.

Princess Diana at an event

John, the eighth Earl of Spencer, married Frances back in 1954.