Top of the Pops 12 April 1979:
Legs & Co. dance to Silly Thing by the Sex Pistols.
Thanks to ASmK for the YouTube post.
From the old blog, Wednesday, 3 November 2010:
Legs & Co try their hardest to be all punky and sneery and atitude-y, dancing to the Sex Pistols’ Silly Thing: but we all know the truth – they’re a bunch of sweetie, softie good girls.