Prince Harry and Meghan Markle have 'squandered tremendous chance to do good as ...

Prince Harry and Meghan Markle have squandered a 'tremendous chance to do good as royals', according to a new book, and they will not be welcomed back to the UK unless they make a fortune in .    

Author Lady Colin Campbell claims that the couple have been bogged down in 'petty squabbles' which has prevented them doing humanitarian work.

She said that they are 'squandering this tremendous opportunity' because of Harry's 'mental health problems' and Meghan's 'personality problems'. 

Prince Harry and Meghan Markle have been bogged down in 'petty squabbles' which has prevented them doing humanitarian work, claims Lady Colin Campbell

Prince Harry and Meghan Markle have been bogged down in 'petty squabbles' which has prevented them doing humanitarian work, claims Lady Colin Campbell

The 70-year-old author of behind-the-scenes book, Meghan and Harry: The Real Story, says if the couple were 'sincere humanitarians' they would know they had a perfect springboard to do good work.

'What surprised me the most about Meghan and Harry when I looked into what was really going was what a tremendous opportunity they had to do good all over the world,' Lady Colin Campbell told Fox News.

'And if they were sincere humanitarians, they would know they had an absolutely perfect springboard for doing the most wonderful work and how they were bogged down in petty squabbles.

'Because of his mental health problems and because of her personality problems, they are squandering this tremendous opportunity and making it very unlikely that they would achieve their stated objectives or achieve what everybody hoped they would achieve,' she claimed.

The 70-year-old royal biographer said they are 'squandering' a tremendous opportunity to do wonderful work because of 'mental health' and 'personality problems'

The 70-year-old royal biographer said they are 'squandering' a tremendous opportunity to do wonderful work because of 'mental health' and 'personality problems'

The royal biographer published her new book 'Meghan and Harry: The Real Story,' in June 

The Jamaican-born British writer also penned the 1992 best-selling biography, Diana in Private: The Princess Nobody Knows. 

Her most recent book aims to provide a 'behind-the-scenes authoritative account' covering Meghan and Harry's whirlwind romance, high-profile marriage as well as their decision to step back as senior members of the British royal family.  

'I try not to show them at their worst,' the 70-year-old continued. 

'And I also

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