Sophie Skelton as Matilda "Mattie" Kerrigan
"Want me to answer you, best not to call me Matilda."

James and Oliver Phelps as Fred & George Weasley
"Mattie is completely and utterly mad, that's one of the reasons why we are friends."

Introducing......

Hannah Dodd as Millicent "Millie" Kerrigan
Harriet Cains as Minerva "Minnie" Kerrigan
Ruby Stokes as Cordelia Kerrigan
Sadie Soverall as Beatrix "Trixie" Kerrigan
Milly Alcock as Keely Kerrigan
Kit Conner as Kipling Kerrigan
Geraldine James as Maryse Kerrigan
Pierce Brosnan as Tertius Kerrigan