History YMMV / WhodunnitUK

* RetroactiveRecognition: Although the performers in the short films often included familiar faces from the British stage and screen (such as Edward Sinclair, Creator/FrankThornton, Creator/BurtKwouk, and Creator/KateOMara), some of the cast members' most famous roles were still years ahead of them:

** Mavis from "Drag Act" is played by Creator/VivienneJohnson, who would later be best known for playing Young Mr. Grace's Nurse in ''Series/AreYouBeingServed''.

* RetroactiveRecognition: Although the performers in the short films often included familiar faces from the British stage and screen (such as [[Series/DadsArmy Edward Sinclair]], Creator/FrankThornton, [[Film/AShotInTheDark Burt Kwouk]], and Creator/KateOMara), some of the cast members' most famous roles were still years ahead of them:
** The voice of photography studio investor Ralph Damon from "Portrait in Black" may be more recognisable to modern viewers than his face, as his actor, Gerald Flood, provided the voice of Kamelion in the Creator/PeterDavison era of ''Series/DoctorWho'' several years later. Meanwhile, his fellow suspect, hairdresser Ray Hunt, is played by a young David Yip, six years before his breakthrough role in ''The Chinese Detective'' (and nine years before his single scene as Wu Han in ''Film/IndianaJonesAndTheTempleOfDoom'').

* RetroactiveRecognition: Although the performers in the short films often included familiar faces from the British stage and screen (such as [[Series/DadsArmy Edward Sinclair]], [[Series/AreYouBeingServed Frank Thornton]], [[Film/AShotInTheDark Burt Kwouk]], and Creator/KateOMara), some of the cast members' most famous roles were still years ahead of them:

* RetroactiveRecognition: Although the performers in the short films often included familiar faces from the British stage and screen (such as [[Series/DadsArmy Edward Sinclair]], [[Series/AreYouBeingServed Frank Thornton]], [[Film/AShotInTheDark Burt Kwouk]], and [[Series/TheBrothers Kate O'Mara]]), some of the cast members' most famous roles were still years ahead of them:

** Mary Tamm appeared as suspect Valerie Austin in "Nothing to Declare" several years before being cast in her most famous role as the first Romana in the Creator/TomBaker era of ''Series/DoctorWho''.

** DI March in "Time to Dye" and Philby in "A Dead Cert" were both played by Paul Darrow, who was still a few years away from being cast as Avon in ''Series/BlakesSeven''.

** Commander Blade of [=MI5=] in "Too Many Cooks" was played by Clive Swift over fifteen years before he found more enduring fame as HenpeckedHusband Richard Bucket in ''Series/KeepingUpAppearances'', while suspect Clarence Brooks was played by Edward Hardwicke over a decade before he played Watson to Creator/JeremyBrett's Holmes in Creator/{{ITV}}'s ''Series/SherlockHolmes'' adaptations.

* RetroactiveRecognition: Although the performers in the short films often included familiar faces from the British stage and screen (such as [[Series/DadsArmy Edward Sinclair]], [[Series/AreYouBeingServed Frank Thornton]], [[Film/ThePinkPanther Burt Kwouk]], and [[Series/TheBrothers Kate O'Mara]]), some of the cast members' most famous roles were still years ahead of them:

** Among the suspects in "Death at the Top" is Malcolm Jackson, played by Christopher Biggins when he was still mostly known as a character actor; his performance as Nero in ''Series/IClaudius'', just the first of many roles that brought him to a wider audience, was still a year away.