fˈɜːθ ɡɹˈuː ˌʌp ɪn bɹˈɪstəl, ɐtˈɛndɪŋ ˈɛlmliə pɹˈaɪmɚɹi skˈuːl, klˈɪftən kˈɑːlɪdʒ, ænd bɹˈɪstəl ɡɹˈæmɚ skˈuːl.
Firth grew up in Bristol, attending Elmlea Primary School, Clifton College, and Bristol Grammar School.