Phoenix Laroche William Samantha Colley Mother Tilly Vosburgh Mary (Momo) (voice) Alex Lawther Velveteen Rabbit (voice) Helena Bonham Carter Wise Horse (voice) Paterson Joseph King (voice) Lois Chimimba Car (voice) Clive Rowe Lion (voice) Sean Duggan Teacher Nathaniel Parker Male Rabbit (voice) Bethany Antonia Female Rabbit (voice) Nicola Coughlan Playroom Fairy (voice)