Prince William could join forces with James Middleton after 'Kate and Pippa played key roles in his recovery'

James credited his dog Ella as well as his sisters Kate and Pippa for helping him during his mental health battle.

Kate and William both highlight the importance of mental health awareness throughout their work as members of the Royal Family.

Royal commentator Jennie Bond has tipped William to team up with James if his wife's younger brother is open to a public engagement alongside the future king.

Bond told OK!: "Catherine and Pippa were both clearly key to helping him recover.

"If he was happy to do so then, yes, it might prove very effective for James to work with William on some mental health campaigns. But he may not want that public profile.

"It's just good to know that, with the right support, it is possible to see life in a more positive light."

In his new book titled Meet Ella: The Dog Who Saved My Life, James Middleton opens up on his battle with depression and a pivotal trip to the Lake District with his dog Ella.

James said he had no phone signal for the two and a half days he was in the Lake District and once he left and was able to receive texts and calls he messages from his family who were concerned for him.

He writes: "We set out, the dogs and I, on our southbound journey and I know the exact spot where the mobile phone signal comes back.

"The pings come thick and fast. 'Where are you, James?' 'We're ­desperate to get hold of you.' 'OK, we're really worried now.'

"My family thought I had gone away to die, to end my own life. I realise that now.

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"I feel full of regret for not recognising just how ­panicked I'd made them.

"At the time, however, irrationally – and unjustifiably – I feel annoyed, controlled. I'm a grown man. It has been the most formative trip of my life.

"I had not gone away to end my life. I'd gone to find a reason to live. And I'd discovered it. So why was ­everyone intruding?

"I picked up a voicemail from Pippa: 'James, we're all so worried about you. Where on earth are you?' Her voice was tearful with concern, with just an edge of reprimand."

Anyone who is in emotional distress, struggling to cope or at risk of suicide can call the Samaritans anonymously for free from a UK phone on 116 123 or go to samaritans.org.