One of three appearances of actor Thorley Walters in a John le Carré filmed adaptation. The first was in an episode of the television mini-series Tinker Tailor Soldier Spy (1979) [See: Tarr Tells His Story (1979)], the second was in the theatrical feature film cinema movie The Little Drummer Girl (1984), whilst the third and final appearance was in the tele-movie A Murder of Quality (1991), the latter which was also Walters' final ever film and television appearance. Walters appeared in every kind of John le Carré adaptation: a tele-movie, a TV mini-series, and a theatrical feature film.
Despite playing the most important character, Ale Guinness 's performance clocks at around 25 minutes.