preemptors of punk, or the last dregs of shock rock?

The Tubes, a band whose very existence I'd forgotten!

 c.f. Musical Vomit, the theatrical shock rock band formed by future members of Human League and Heaven 17 at the youth drama / arts center in Sheffield (the Meatwhistle)

There was a South Bank Show them, I believe. The Tubes, not Musical Vomit.

This isn't it, I don't think.

Lampoon rock.

Didn't this number usually involve a gigantic cigarette onstage?