I am from london, and i want to get a backup of bioshock for my pc, it is not out in the uk yet so i was thinking would the ntsc one work on my pc?
yes. NTSC/PAL is not an issue with PC's (assuming your using a normal PC monitor and not a TV (even then shouldn't be a problem)).
I didn't even think PC games HAD regions, but no, every PC game can play on every PC (Being good enough that is)