 Michael SheenAneurin 'Nye' Bevan | Aneurin 'Nye' Bevan |
 Sharon SmallJennie Lee | Jennie Lee |
 Remy BeasleyGwen Davies | Gwen Davies |
 Jon FurlongHerbert Morrison/Mr Howells | Herbert Morrison/Mr Howells |
 Roger EvansArchie Lush | Archie Lush |
| OOliver Llewellyn JenkinsEnsemble and Swing | Ensemble and Swing |
 Rhodri MeilirDavid Bevan/Councillor Hopkins | David Bevan/Councillor Hopkins |
 Tony JayawardenaDr Dain/Winston Churchill | Dr Dain/Winston Churchill |
 Kezrena JamesNurse Ellie/Arianwen Bevan | Nurse Ellie/Arianwen Bevan |
 Dyfan DwyforSpeaker/Luke Williams | Speaker/Luke Williams |
| MMatthew BulgoMr Orchard/Mr Francis | Mr Orchard/Mr Francis |
| RRoss FoleyClerk/Ross Doherty | Clerk/Ross Doherty |
 Daniel HawksfordNeil Jones | Neil Jones |
| BBeau HollandMrs Jones/the Cleaner | Mrs Jones/the Cleaner |
 Stephanie JacobClement Attlee/Matron | Clement Attlee/Matron |
| MMichael KeaneOwen Thomas/Councillor Morgan | Owen Thomas/Councillor Morgan |
| NNicholas KhanNeville Chamberlain/Dr Frankle | Neville Chamberlain/Dr Frankle |
 Rebecca KillickLucy Pritchard | Lucy Pritchard |
| MMark MatthewsMark Smith/Mr Leslie/Graham the Porter | Mark Smith/Mr Leslie/Graham the Porter |
| AAshley MejrWilliam Jones/Mr Llywellyn/Chris the Porter | William Jones/Mr Llywellyn/Chris the Porter |
 Lee MengoJack Stockton | Jack Stockton |
| DDavid MontiethMr Fury | Mr Fury |
| SSara OtungSara Roberts/Mrs Lewis | Sara Roberts/Mrs Lewis |
 Mali O'DonnellEnsemble and Swing | Ensemble and Swing |
