Could X-craft have been used to lay nuclear mines in the 1950s?
Short answerThe possibility was examined, but no navy actually adopted the mission.
NotesThe answer distinguishes between a technically explored mission and an operational one. British planners considered whether X-craft could deliver nuclear mines during the 1950s, but the idea did not become an adopted naval capability. That difference matters when reading post-war weapons proposals, because a study or plan does not prove that crews trained for the mission or that weapons entered service. The caution prevents an investigated concept from being mistaken for an operational capability.