“They were very clear that this was going to draw a line under it. That was all, there was no more.
“They felt they had said everything they had to say about their mother and their mother’s death and they were planning to move on with the TV projects.
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“If Harry and Meghan go against that and create a program on Diana for Netflix, I think it will only add salt to the wounds of the already very, very fundamentally damaged relationship between William and Harry. ”
His comments come as ITV royal correspondent Chris Ship has argued that Netflix likely wants Meghan and Harry to be on screen in some of its shows.
Speaking on ITV’s royal rotation, Mr Ship said: ‘I doubt Netflix would have handed Harry and Meghan so many millions of pounds if they hadn’t agreed to at least be shown in some of the its shows that they do. ”
Producer Lizzie Robinson added: “They do a lot of important work but Harry and Meghan’s draw is themselves.
With the new deal, the Duke of Sussex has repaid the £ 2.4million in taxpayer money used to renovate Frogmore Cottage.
A spokesperson for Harry confirmed that the Duke paid the bill in full by contributing to the Sovereign Grant.
The payment was made possible thanks to the Duke and Duchess of Sussex’s multi-million pound new Netflix deal, a source said.
Royal accounts last year showed the cost of the renovations – paid for with taxpayers’ money – to be £ 2.4million.