Flynn was born in Johannesburg, South Africa, the son of Eric Flynn, a British actor and singer, and Caroline Forbes. From his father's first marriage he has two older half-brothers, actors Jerome Flynn and Daniel Flynn, and an older half-sister, Kerry Flynn, and from his father's second marriage, a younger sister, Lillie Flynn, who sings with the Sussex Wit. At the age of two he moved with his family to the UK.
Flynn won a music scholarship to Pilgrims School, an independent school in the city of Winchester in Hampshire, where he sang in the chapel choir and was required, due to his scholarship, to learn two instruments: the violin and trumpet.Later, he would teach himself guitar and win a second music scholarship to Bedales School, an independent school in the village of Steep, near the market town of Petersfield, also in Hampshire[6], before moving on to Webber Douglas Academy of Dramatic Art to study acting.
Flynn has scars on his face from an attack by a Staffordshire Bull Terrier when he was a child in South Africa.
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