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| Episode credited cast: | |||
| Andrew Faulds | ... |
Ian Souter
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Ann Morrish | ... |
Heather Keys
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Michael Atkinson | ... |
Robert Shoesmith
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| Faith Brook | ... |
Dr. Bradbury
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| Peter Bowles | ... |
Dr. Fothergill
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| Mark Kingston | ... |
Geoff Barnes
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John Bryans | ... |
John Maynard
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| David Graham | ... |
Henry Thorne
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| Rest of cast listed alphabetically: | |||
| Donald Hewlett | ... |
Fairchild
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Invited to discover why a research laboratory is losing money, even though they have a monopoly in the medical research trade, the Protectors discover that someone is making overtures to the competition and is prepared to sing - for a price. Written by BGP
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