5 February

5 February was a date.
In 1811, the British Regency began when King George III lapsed into "permanent madness". (PROSE: The Adventuress of Henrietta Street, AUDIO: Frostfire)
In 1814, the Twelfth Doctor and Bill Potts set free a creature that lived under the Thames. (TV: Thin Ice)
In 8891, the Ellarchon Dyson Sphere collapsed. (PROSE: Time Traveller's Diary)