| Directed by | |
|---|---|
 | Morgan Matthews |
| Starring | ||
|---|---|---|
 | Asa Butterfield | Nathan Ellis |
 | Rafe Spall | Martin Humphreys |
| Sally Hawkins | Julie Ellis |
| Eddie Marsan | Richard |
| Jo Yang | Zhang Mei |
| Martin McCann | Michael Ellis |
| Jake Davies | Luke Shelton |
| Alex Lawther | Isaac Cooper |
| Alexa Davies | Rebecca Dunn |
| Orion Lee | Deng Laoshi |
| Edward Baker-Close | Nathan Ellis (9 yrs) |
| Percelle Ascott | Ben Morgan |
| Suraj Rattu | Pav Kamdar |
| Jamie Ballard | Headmaster |
| Clare Burt | Doctor |
| Adam Foster | Paediatrician |
| Lee Zhuo Zhao | Li Jing |
| Shannon Beer | Caz |
| Tasha Connor | Jessie |
| Lawrence Jeffries | Schoolboy 1 |
| Ciaran Wakefield | Schoolboy 2 |
| Song-Hung Chang | Employee |
| Bo-Han Huang | Luke's Buddy |
| Joseph Barnes | Canadian Maths Student 2 |
| Karl Ng | Mei Ping Wu |
| Lewis Adams | Smoking School Pupil |
| Jessica Arden | Alla (Russian IMO Team) |
| Lee Bolton | Multiple sclerosis patient |
| Jason Thomas Brown | Indian IMO Contestant |
| Leo Chell | Family member |
| Colin Coombs | MS Sufferer in Meeting |
| Paul J. Dove | John |
| James Frost | Multiple Sclerosis Sufferer |
| Joseph Myers | UK Team Assistant |
| Mick Slaney | Parent |
| Patricia Winker | Invigilator |
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UK release date: 13th March 2015
Ireland release date: 13th March 2015
Hong Kong release date: 19th March 2015 New Zealand release date: 26th March 2015
Thailand release date: 26th March 2015 United States
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