- Black Lion Films
- Witzend Productions
- (A Witzend Producton)
- ITC Films
- (from)
- ITC Film Distributors
- (United Kingdom, 1979)(ITC Film Distributors Limited, theatrical)
- Bellevue Film Distributors
- (Canada, 1979)(theatrical)
- Roadshow Films
- (Australia, 1980)(theatrical)
- 4 Front Video
- (United Kingdom, 1993)(VHS)
- Precision Video
- (United Kingdom, 1980)(VHS)
- Berman's and Nathan's
- (Bermans & Nathans Ltd., costumes supplied by)
- G.S.E.
- (G.S.E. Ltd., titles)
- Governor and Staff of H.M. Prison Chelmsford
- (the Governor and Staff of H.M. Prison Chelmsford, the producers would like to thank: for their help in the making of this motion picture)
- Lee Electric Lighting
- (Lee Electric {Lighting} Ltd., lights by)
- Panavision Equipment
- (filmed with)
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