|Directed by||Don Sharp|
|Produced by||Peter Snell|
|Screenplay by||John Gay|
|Music by||John Scott|
|Edited by||Erik Boyd-Perkins|
- Rod Steiger ... Niall Hennessy
- Lee Remick ... Kate Brooke
- Richard Johnson ... Insp. Hollis
- Trevor Howard ... Cmdr. Rice
- Peter Egan ... Williams
- Eric Porter ... Tobin
- Ian Hogg ... Gerry
- Stanley Lebor ... Hawk
- John Hallam ... Boyle
- Patrick Stewart ... Tilney
- David Collings ... Covey
- John Shrapnel ... Tipaldi
- Hugh Moxey ... Burgess (M.P.)
- Margery Mason ... Housekeeper
- Paul Brennan ... Maguire
- Paul Blake ... Rally Leader
- Patsy Kensit ... Angie Hennessy
The British Board of Film Classification initially refused to classify the film because it contained footage of Queen Elizabeth II speaking at the State Opening of Parliament and apparently reacting to something happening in the House of Lords. Producer Samuel Z. Arkoff managed to get it passed by adding a disclaimer stating that the British Royal Family had not participated and footage of the Queen was from newsreel. The Rank Organisation then refused to screen the film in its Odeon Cinemas, citing commercial reasons. EMI also refused to distribute it. As a result it was only shown at a small number of independent cinemas.
- Variety film review; 23 July 1975, page 20.
- anonymous (1974). "no title". Journal: Society of Film and Television Arts. 1–2: 20.
- Kevin Rockett (1996). The Irish Filmography: Fiction Films, 1896-1996. Red Mountain Media. p. 184. ISBN 0952669803.