X-Ray Spex were, in my mind, the very best of the one-album-wonder punk bands. Germfree Adolescents is very nearly a perfect album, and then Poly Styrene got religion and quit.
Well, at least she's still alive.
By the way, this is a studio overdub; the track is taken straight from the album and synched up to the live performance. Still, it's such a great song. A somewhat more authentic video is the "Identity" video.