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Knopfler and Withers (who had not actually been in The Droop at the same time) went on to great success in the band Dire Straits.
As perhaps a bit of an in-joke, the Dire Straits song "Industrial Disease" (which Knopfler wrote and sang, and Withers drummed on) mentions "Brewer's Droop" in the context of a diagnosed malady, alongside smoker's cough.