i think i had just turned 13 or 14 when BBC2 started advertising BTVS. i remember walking down the corridor in school, and my friends were commenting on a show they'd seen advertised, Buffy, The Vampire Slayer. almost everyone thought it sounded really lame, like 'OMG, what sort of show is THAT gonna be?' but i was actually really interested.
so i went home, checked the TV Guide, saw which day it was gonna be on, and posted reminders all over my room.
I watched WTTH, and thought 'hey, this is actually pretty cool. That Xander guy's pretty cute.' so basically, for the first season, i watched for Xander, lol.
and then, by the time S2 had started, we got cabel, so i was able to watch it on Sky One, and then, like Jules said, they put it on hold, so i went back to BBC2 and watched the eps i'd already seen. but by that time i was already hooked, and was going through with drawls waiting for the show to pick up again! lol