Prince Harry and Meghan Markle are 'miserable and unhappy' as he battles a new 'wave of agony' after retracing his mother's steps in Africa, according to royal biographer.

Speaking on Sky News, Angela Levin said: 'I think [Harry] feels and looks incredibly miserable and unhappy.

'Meghan is unhappy too and it seems incredibly sad that they can't seem to help each other at the moment.'

She added said that retracing his mother Diana, Princess of Wales' steps in Angola earlier this month could be at the root of 35-year-old Harry's distress.

Prince Harry and Meghan Markle (pictured in Johannesburg on October 4) are 'miserable and unhappy', according to royal biographer Angela Levin

The royal author suggested Harry (pictured left) is battling a new 'wave of agony' after following in the steps of his mother, Princess Diana (right) - who famously walked through a partially cleared Angolan minefield in 1997

'It seems unfortunate now,' Angela said. 'He is having another wave of agony over his mother, Princess Diana. The trip was going to be very difficult as he was retracing his mother's steps.'

Harry made an 'emotional' pilgrimage to Huambo to follow in the steps of his mother - who famously walked through a partially cleared Angolan minefield.

During a day of symbolism that saw Harry wear body armour and a protective mask as Diana had done to watch a de-mining team at work, and tour an orthopaedic unit she visited – he said her memory remains with him 'daily' and her 'legacy' lived on.

He added that the visit was 'deeply personal and meaningful' to him.

It comes after Harry and Meghan (pictured on the programme) opened up in a behind-the-scenes documentary on Sunday, which followed the pair on their ten-day tour of South Africa

Meanwhile, Angela suggested that there is more to the royal pair's 'unhappiness' than just the prince's recent trip.

It comes after Harry and Meghan opened up in a behind-the-scenes documentary on Sunday, which followed the couple during their ten-day tour of South Africa.

In ITV's 'Harry & Meghan: An African Journey', the former Suits actress revealed she was 'existing not living' while her husband spoke out about his struggles with mental health.

Meghan described struggling with the pressures of royal life and the 'damaging' impact of a British stiff upper lip.

In what was the first on-screen interview since becoming a mother, the American former actress admitted to feeling 'vulnerable' during her pregnancy with Archie under the media spotlight.

Meghan added: 'I never thought that this would be easy, but I thought it would be fair and that's the part that's really hard to reconcile.

'I've said for a long time to H – that's what I call him – it is not enough to just survive something. That's not the point of life. You've got to thrive and feel happy.

She added: 'I really tried to adopt this British sensibility of a stiff upper lip. I tried, I really tried. But I think what that does internally is probably really damaging.'