Rudkin's play drew parallels between the political context of Casement's life and times with contemporary issues in 1973, including themes exploring the legacies of nationalism and violence. Radio critic
Gillian Reynolds praised the broadcast as a major success, with an innovative style that matched the complexity of the subject matter. "Through Norman Rodway's magnificent central performance as Casement," wrote Reynolds, "both Mr Rudkin and his producer John Tydeman found the means of bringing the irony, the sensuality, the political passion together in a work of totally admirable richness and force." "One of the great masterpieces of radio drama writing and directing," according to radio drama producer Alan Beck, who also noted its daring subject matter for the time, including political violence and frank depictions of homosexuality. The
Sunday Telegraph observed that, according to scholars, the play's content was not always historically accurate, but nonetheless praised the writing, direction and performances to conclude that the broadcast was "a tour de force." Writer
Brian Inglis criticized the work for a lack of accuracy, particularly with respect to Casement's homosexuality and intersection with his growing nationalism. Biographer
B. L. Reid was more sympathetic to Rudkin's postulate. Rudkin subsequently replied to Inglis with a lengthy rebuttal in
Encounter, arguing that his work, albeit with poetic liberties, more accurately portrayed the inner life of the man and his motivations.
Richard Mayne expressed a similar sentiment, calling the play "near-fiction" but acknowledging it as compelling drama. Poet
Anthony Thwaite writing for
The Listener praised it as "a rich, powerful, thickly plotted but always clear piece of writing...imaginative radio at its best," singling out Rodway's performance and the subtlety of Tydeman's production aesthetic.
The Sunday Times described it as "monumental", pointing out that the intention of the piece was clearly impressionistic and not intended to be rote history..."a long, moving radio poem."
Paul Ferris writing for
The Observer, expressed skepticism at the connection drawn between Casement's sexual orientation and his nationalism, but nonetheless described it as "a powerful text". Professor
David Ian Rabey has described the play as "astonishing" and "regrettably overlooked". In
Sight Unseen, a study of radio drama's medium specificity, Elissa S. Guralnick cites the play as a prime example of the medium's ability to use its adjacency to documentary and journalistic forms to achieve a dramatic intent. Radio also allowed Rudkin to maintain the "essential interiority" of Casement's diaries, bringing to life the character's internal thoughts and feelings and sharing them with the audience but not with other characters. Portions of the broadcast's sound design was incorporated into
The Casement Project, a dance piece lead by Fearghus Ó Conchúir and inspired in part by the play. It was commissioned by the Arts Council of Ireland in 2016. ==Stage adaptation==