An 11-year-old Canadian girl has become one of the first people to change the sex designation on her birth certificate after new laws making it simpler to do so.
Harriette Cunningham, 11, was born a boy called Declan.
She filed paperwork in 2013 to change her name with support of her family.
She also began a letter-writing campaign to government officials allowing her to change her gender on official documents.
"It just made me so mad and made me almost frustrated to know that I'm a girl and then I look on my passport and it says that I'm a boy," Cunningham told CTV News, external.
She is one of the first 30 people in British Columbia, Canada, to do so without having gender reassignment surgery, which the new legislation allows.
"I'm really happy. It matters to me to have me properly represented," she told The Province, external. "It's not just a piece of paper."
She has previously been close to tears at airports, she says, when security were suspicious of her passport not matching her physical appearance.
"She would rebel from getting her hair cut at a young age, and she would gravitate toward things our society would identify as really feminine," her father Colin Cunningham said.
"As early as kids can figure out who they are, she was pretty steadfast in her identity, and she's really shown us the way through this.
"We weren't prepared for how strong and sure of herself she really is, so that's been a lesson to us, too."
In the UK, you must be 18 years old or older, be diagnosed with gender dysphoria (unhappiness with your birth gender), have lived as your new gender for two years and intend to live in your changed gender for the rest of your life.
Then you must apply to the Gender Recognition Panel and be willing to end your marriage or civil partnership if in one.
The Home Office says there are no plans to look into the Canadian model for the UK.
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