'It's like watching yourself in a car crash!'

Robbie has been candid about his mental health issues in the lead up to his milestone birthday and opened up on the horror of relieving his past traumas for the documentary.

He told The Times newspaper: "It’s like those nightmares where you don’t know what’s happening and you can’t remember anything and you’re terrified. It was like that all night.

"Oh I've got them all! Dyspraxia, dyslexia, ADHD, neurodiversity, body dysmorphia, hypervigilance…

"It was like watching a crash you were involved in, but in slo-mo. [Making the documentary] was like enduring your mental illness at a very, very slow pace, over a very, very long time. And it’s a niche thing to experience, you know. There aren’t many support groups for it."