Robert Aramayo, right, plays John Davidson, left, in a film about Tourette's syndrome
An actor starring in a film about Tourette's syndrome said it was the "biggest challenge" of his career.
Robert Aramayo, who is from Hull, plays John Davidson, who became the reluctant poster boy for the condition in 1989 when he was 16.
The Lord of the Rings and Game of Thrones actor said he spent a lot of time with Mr Davidson during filming of I Swear.
"It was a real challenge, probably the biggest challenge I've done. Having John there and having his guidance and help was invaluable," Aramayo said.
'Pinch yourself moments'
Tourette's syndrome is an incurable condition, external that causes someone to make sudden, repetitive sounds or movements, known as tics.
Mr Davidson, now 54, is credited as the person who introduced it to many people through a series of documentaries, beginning with John's Not Mad in 1989.
He was later appointed MBE for his campaigning.
The comedy-drama film by Kirk Jones also features Maxine Peake, Shirley Henderson and Peter Mullan.
He said there were "pinch yourself moments" while working with "legends".
"It was intimidating but also the focus was on telling the best story that we could and that's why they're all amazing at what they do," the actor added.
Aramayo said it was a "surreal experience" when he returned to his home city for a screening of the film, where his history teacher was in the audience.
"It was really, really lovely to be back in the Odeon where I used to go and see all kinds of films there when I was a kid," he said.
He advised those in Hull who wanted to act to "just go for it".
"I was lucky enough to be involved in Hull Truck Theatre and they're amazing and I'm sure there's loads of groups like that," he said.
"If you believe it, just go with it."
I Swear is in UK cinemas from 10 October.
From BBC