Those Doctor Who episodes, along with the previously mentioned 'The Empty Child', while unquestionably awesome, aren't really competitive on scares. Yes, they're unnerving, and very well done, but at the end of the day, they just wern't about the horror, and the fact that they all have a resolution is enough to nullify their effect, somewhat.Macgyvercas said:The "Ju-On: The Grudge" series (not the American remakes).
If you want to be really freaked out, and don't mind watching a TV show, check out the Doctor Who episode "Blink" (series 3, David Tennant). Watch it at night for the most profound effect. I couldn't sleep for a week.
Also, the episodes "Forest of the Dead" and "Silence of the Library" will make you never want to set foot in the dark again.
That said, they're certainly not tame, and all have some credibly unnerving moments.