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| Cast |
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| Deputy Chief Constable John Stalker | SHEPHERD, Jack |
| Det. Chief Supt John Thorburn | CALDER, David |
| Det. Chief Insp John Simons | RYAN, John |
| Det. Sgt Eileen Scarrett | CUNLIFFE, Jane |
| Chief Con Sir John Hermon | McKENNA, T.P. |
| Asst Chief Con Trevor Forbes | McELHINNEY, Ian |
| Det. Supt Thomas George Anderson | MAGUIRE, Oliver |
| Det. Chief Insp Samuel George Flanagan | SHANE, George |
| detective inspector | DRURY, Patrick |
| Con. John Robinson | HAWLEY, Richard |
| Con. David Brannigan | WHELAN, Gary |
| Sergeant X | HARRIS, Aaron |
| Constable X | O'MALLEY, Daragh |
| Constable Z | HOLLAND, Dick |
| MI5 officer | CELLIER, Peter |
| Michael Tighe | BIRCH, Barry |
| Martin McCauley | McKENNA, Breffni |
| director of public prosecutions | GREENE, James |
| HM insp of constabulary for the North West | MATHEWS, Tony |
| Mr Tighe | LAMB, Peadar |
| IRA informant | RIMKUS, Stevan |
| Professor Marshall | HAWTHORNE, Denys |
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| Credits |
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| Director | KOSMINSKY, Peter |
| Production Company | Zenith Productions |
| Sponsor | Yorkshire Television |
| Producer | STAFFORD-CLARK, Nigel |
| Executive Producer | RICHARDSON, Keith |
| Production Manager | LOVER, Peter |
| By | EATON, Michael | |
| Photography | PYRAH, Alan |
| Editor | ASPINALL, David |
| Production Designer | LONG, Mike |
| Art Director | HALL, Agnes | |
| Music | PORTMAN, Rachel |
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