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Roland Culver as Patrick Pryton |
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John Bryans as Holden Britwell |
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Donald Hewlett as William Featherstone |
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Andrew Sachs as Nigel Fenn |
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Robert Sansom as Sir Lionel Pratt |
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Robert Morris as Bobby Touche |
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Mona Washbourne as Julia Pryton |
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Basil Dignam as Sebastian Fleming |
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William Kendall as Andrew Lodge |
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Maurice Hedley as Lord Densham |
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Paul Williamson as George Crowell |
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Basil Henson as Charles Baldon |
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Earl Cameron as Dr. Henry Mbala |
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Henry Moxon as David Turville |
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John Boxer as John Straker |
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Jack Gwillim as Admiral Sir Guy Lawrence |
| Writing | John Finch | Writer |
| Directing | Michael Apted | Director |
| Production | Julian Amyes | Producer |
| Writing | Ronald Miller | Writer |