Hennessy (1975, Don Sharp)
Not a bad 70s political thriller, whose promotional team at the time touted Queen Elizabeth's dismissal - though her appearance figures prominently in the last third of the film. In it Rod Steiger plays a former IRA operative bent on revenge after a British soldier (inadvertently) kills his wife and child. Lee Remick joins Steiger with the Irish brogue and rounds out a cast full of illustrious British actors. It's an above average thriller streaming on APrime. There's a poor copy streaming on YouTube as well.
A hairy Patrick Stewart and Steiger