User blog comment:Barry19/How did they remember?/@comment-3148529-20140329131955

ne of the Daleks in TTOTD said "Information concerning the Doctor was harvested from the cadaver of Tasha Lem." So that's how that happened.

Second: I kind of got the impression that the Cybermen from Nightmare in Silver onwards were sort of technological amalgamations of the Cybus Cybermen and Mondasian Cybermen, which is apparently Neil Gaiman's opinion as well.

Also, the Weeping Angels don't always send their victims back in time - in The Time of Angels/Flesh and Stone they just snapped their necks.