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.
Interestingly the Archive feature, retelling the story, starts Episode One with “Doctor Who takes the Brigadier ...”
The Matrix Data Bank answers a readers query regarding the disappearance of the Star Profiles features which were alternating with interviews. The explanation given is that the biographical information (basis of the Star Profiles) often came out at the start of interviews and was felt to be more reliable.
The Photo-File is credited to Jeremy Bentham with thanks for research help to Trevor Wayne.