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Luke Treadaway
Christopher Boone

Niamh Cusack
Siobhan

Paul Ritter
Ed

Nicola Walker
Judy

Una Stubbs
Mrs Alexander/Voice Six/Ensemble

Sophie Duval
Mrs Shears/Mrs Gascoyne/Voice One/Ensemble

Nicholas Sidi
Mr Shears/Mr Wise/Duty Sergeant/Voice Two/Ensemble

Matthew Barker
Mr Thompson/Policeman/Voice Three/Ensemble

Rhiannon Harper-Rafferty
No. 44/Punk Girl/Voice Five/Ensemble

Howard Ward
Reverend Peters/Rhodri/Uncle Terry/Voice Four/Ensemble