“SAD” King Charles is growing increasingly frustrated with Prince Harry’s behaviour, claims an insider.

The Duke of Sussex, 38, has repeatedly bashed the Firm – which saw him only touchdown in the UK for a brief 24 hours for his dad’s coronation.

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Bombshells were dropped in Harry’s explosive memoir Spare – where he dubbed Camilla a “bully” and told how he begged Charles, 74, not to marry her.

Sources close to the new reigning monarch have now alleged he is becoming tired with the Royal’s behaviour.

An insider told The Times: “The King brings Harry up every time I see him.

“I don’t think we’ve moved past sad and bewildered, but there’s a bit more frustration at his behaviour, because it just keeps going.”

It comes after the King recently flew to Romania when Harry was in the country.

The Duke of Sussex was in London last week for a court case at the High Court.

The Royal was being quizzed as part of the phone hacking trial against Mirror Group Newspapers.

The court heard him make several shocking revelations, including details of a dramatic “car chase” and a lap dance, during the gruelling seven-hour probe by the Mirror group’s lawyer.

But he struggled to remain composed as he was questioned over his own accusations that journalists at the Mirror hacked his phone between 1996 and 2010.

His testimony appeared to fold under scrutiny as he was cross-examined over two days, with the prince yesterday admitting 18 times in three hours “I don’t know”.

In March Harry started a battle against Associated Newspapers Limited (ANL) over claims of unlawful information gathering.

The privacy hearing came as Harry’s book Spare was published back in January revealing shocking claims.

Shortly before, Harry and Meghan released a Netflix docuseries about their struggles being a part of the Royal Family.