I was sitting here idly listening to a 1973 Little Feat bootleg from the Internet Archive and when they got to Willin, Lowell George introduced it with the words “This one goes out to one of my favourite groups, Slade”. If that made you smile, you’re too old. If it didn’t, you might as well be dead.
Later, LG explains that the only club he ever goes to is the Whiskey-a-Gogo, and “all the English groups play there”. So perhaps Slade did attempt the American market. The mind reels.
(The wikipedia article claims that they were the originals for Spinal Tap. Lick my love pump, baby!)