Leila Mimmack was born on 5 November 1993 in Leamington Spa to parents Maddy Kerr and Peter Mimmack, who run the Heartbreak Productions theatre company in Spencer Yard, Leamington is an English actress.. Mimmack went to Stratford-upon-Avon College. During her eight year at school Mimmack's teacher described the destruction of the rain forest, which had a big effect on her. Mimmack later became a climate change campaigner and attended rallies and marches. When she was 19 she moved to a narrow boat moored in Hackney marshes, partly because of environmental reasons.