Acting Marianne Oldham Biography Marianne Oldham is a British actress. Acting A Monster Calls Mum / Ensemble 2018 National Theatre Live: Rosencrantz & Guildenstern Are Dead Gertrude 2017 Finding Your Feet Nicola 2017 Distance Susan 2016 Absolutely Anything Rosie 2015 Titus Young Jeanette Carter 2013 Agent-readable