Until Gemma was 21, she was the perfect daughter. She grew up near Sevenoaks in Kent, the elder of two daughters. Her mother is a Chinese-Scottish pharmacist and her father an engineer from Hong Kong. She spent her evenings after school doing ballet, playing the violin and swimming competitively to national level. She insists, however, she has ‘an impulsive, reckless side’ and likes to unleash it on holiday in Ibiza once a year. After school she considered going to music college, but instead decided to read law at Oxford. She then turned down a training contract with Slaughter and May to spend a year working as a model to save up for drama school, which she had applied to in secret. ‘My parents were worried. It’s not the most stable of jobs and added to that, they are the children of immigrants and come from a background where they didn’t have much; it’s all about security for them. It was difficult; we disagreed over it.’ She finally came clean, after being accepted to the Drama Centre London, whose alumni include Colin Firth and Michael Fassbender. Her father didn’t speak to her for three months, but she has no regrets.