Maisie, I am informed, has some previous acting credits. Stage work, I gather, nothing in television or film. Until now. Sorry, I have no further details.
Sophie is brand new, David and Dan tell me. Well, maybe some school plays. She read for us at her school. Don't confuse her with the DR. WHO Sophie Turner, please, or any of the other Sophie Turners that Google will turn up. (She should probably tweak her name to make it more distinctive. Maybe Sophie R.R. Turner. Worked for me)