Spoilers are precisely defined here. Rules vary by the story's medium. Info from television stories can't be added here until after the top or bottom of the hour, British time, closest to the end credits roll on BBC One. Therefore, fans in the Americas who are sensitive to spoilers should avoid Tardis on Sundays until they've seen the episode.
After retiring from active UNIT service (and, more secretly, from being a companion of the Doctor), Sarah Jane Smith was hired by then-editor of the Metropolitan, the shrewd businessman Percy Wollstonecraft, to create a three-pages article which provided the public with its first glimpse of UNIT. This helped restart Sarah Jane's career as a journalist after her neglect of it during her years as a time-traveller. (PROSE: The Roving Reporter)