I don't think it was a Spaced rip-off either. If anything, it's a rip-off of the Syphon Filter PS1 ad that was banned way back when. (I wish I could find it on YouTube...)
there's a zombie musical number in the movie "dead & breakfast" as well. it's not bad for a low-budget zombie flick. it's actually pretty funny at times.
Time is a great teacher, but unfortunately it kills all its pupils.
Hector Berlioz (1803-69)