Fergie could destroy the Royal family by spilling its secrets

For those who aren’t, there is much Fergie can disclose about the inner workings of the Firm. In Spare, Harry’s anger at its relationship with the press is very apparent. He asserted Camilla traded private family information “to rehabilitate her public image”, and that minor members of the Royal family were sacrificed to the media in order to keep the heat off senior figures.

Meghan became a particular target, he said. As untrue reports swirled, the grey suits at the Palace would not intervene. “They were happy to lie to protect my brother, they were never willing to tell the truth to protect us,” said Harry.

In this regard, Fergie has a great deal of personal experience. Her narrative arc has been nothing short of extraordinary – from “breath of fresh air” to scapegoat for a failed marriage; from improbable semi-insider due to her enduring loyalty for Andrew to now being cast out into the wilderness forever due to her duplicitous dealings with Epstein.

Unlike her ex-husband, she will not be housed and kept, however grudgingly, by the King, on his Norfolk estate. And as there are limited ways in which she can earn a crust, it will be mighty tempting to blow the gaff on her ex in-laws. Unless.

Andrew notoriously paid out something in the region of £12m by way of settlement to the late Virginia Giuffre to end a civil lawsuit brought against him in the US. She had accused him of sexual assault when she was 17 – he paid up, but did not admit liability.

I would suggest the best (and only) way to head off disaster would be a whip-round at Windsor Castle, then slapping a few extra pence on Duchy Originals shortbread and finally a hasty search down the back of sundry gilded mahogany sofas until enough moolah is raised to pay her off.

This is endgame stuff, and drastic action is needed by the Firm. The unpalatable truth is that Sarah Ferguson is going to sing like a canary – unless the Royal family feathers her nest.