Writer/Director Camille Griffin's three sons Roman Griffin Davis, Gilby Griffin Davis and Hardy Griffin Davis play the children of Nell (Keira Knightley) and Simon (Matthew Goode).
Keira Knightley said the film was finished shooting just before the first COVID-19 based lockdown in the UK. Reshoots were picked up in September 2020 to complete the film.
Keira Knightley and Matthew Goode previously starred together in The Imitation Game (2014) and Official Secrets (2019).