Remember that Tin Machine did do a cover of Roxy's 'If There Is Something' from the 1st Roxy Music Album....
This does make me think that Bowie may have thought about doing a cover of this song earlier. If indeed there is a copy of Bowie doing 'Ladytron' somewhere, then there isn't many left on that first Roxy album to cover!
"God thinks he's all that and a bag of chips."- David Bowie