However, he claimed that the couple “could prove that it could remain closed”.
He said in The Hirpod podcast: “I think it just shows how eager they really are to be independent.”
The renovation of Frogham Cottage took place between 2018 and 2019 and is estimated to cost around £ 2.4 million of taxpayers’ money.
Prince Harry’s spokesman said that this month the Duke returned the bill in full by contributing to sovereign grants.
Mr. Scobie said that the royal couple did not “necessarily” return the money.
However, he said that “decreasing” debt could be “an excuse for other things used for you”.
The Duke and Duchess of Sussex will still be able to use Frogham Cottage as their UK residence, it is understood.
Recently, the couple signed a multi-year production deal with video streaming giant Netflix.
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“As new parents, creating inspirational family programming is also important to us, because empowering is the story through a true and trustworthy lens.”
Meanwhile, Netflix chief content officer Ted Sarandos said the firm is “incredibly proud” to have been chosen by Duke and Duchess as their “creative home”.
It is reported that the couple held meetings with several rivals on the streaming site.
Meghan has previously been involved in showbiz – she was known for acting in the American television drama Suite before her marriage to Prince Harry.
However, the Netflix deal is not the only source of income for the couple as they seek financial independence from the royal family.
In June, it was reported that the Duke and Duchess could earn up to $ 1 million per speech after signing up to high-profile speaking agency Harry Walker.
Other celebrities on the agency’s roster include former US President Matthew McConaghy and sports stars like Venus Williams.
The Duke and Duchess stepped in as senior royals and moved to California earlier this year.
They initially lived in Los Angeles, although they have reportedly moved to the coastal area of Santa Barbara.