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.
Additional Input: Matrix Data Bank (From DWM Issue 75). At the end of Episode 8 of the Archive feature on The Invasion it is Captain Turner and not the Brigadier who drives the Doctor back to the TARDIS.
Holiday Specials were traditionally bumper-sized comics/magazines from the publishers of regular titles. They were produced twice yearly and were generally released around Summer and Autumn, in time for the school summer holidays and the Christmas holiday period.
This fifth Special (again offering all-new material) saw a return to the more standard magazine size and was printed in December 1982. It had a cover price of 60p (UK).