The Sarah K-9 stuff was a blast, and seemed to be a direct sequel to the unaired Sarah/K-9 pilot episode from the 1980s.
Just saw the Sarah Jane/School Reunion ep the other day on CBC and found it quite affecting. Bit of a crappy plot otherwise but it was the character side that took the fore (although I like the doc running into these races he already knows that also have the same advantage he does --they change their appearance periodically).
I'm going to have to see if I can't catch this on one of the PBS stations as well --about time to get into Dr Who again. I've only been watching this new series sporadically since last year.