| Episode complete credited cast: |
 | David Wilson | - | Himself - Presenter (as Professor David Wilson) |
 | Kyle Martin | - | John Francis Duffy |
| James Simpkin | - | David Mulcahy |
| Luke Ralfs | - | Principal Cast |
| Blake White | - | Principal Cast |
| Albert Saunders | - | David Mulcahy's Cousin |
| Meg Dawson | - | Alison Day |
| Carli Harris | - | Anne Lock |
 | Lucy-Jane Quinlan | - | Maartje Tamboezer |
| Amy Lawrence | - | Margaret Duffy |
| Rest of cast listed alphabetically: |
| Les Bolland | - | Himself - Herts Police 1973-2003 (as Det Supt Les Bolland) |
| Jeremy Bugler | - | Himself - Former TV Editor |
 | David Canter | - | Himself - Criminal Profiler (as Professor David Canter) |
| Peter Kelly | - | Himself - Met Police 1979-2001 (as Det Const Peter Kelly) |
| Richard Priestley | - | Himself - Schoolmate |
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