Eel Pie Island - on the river Thames near Hampton Court. Did you ever go? Looking back I have some regrets that I didn't, even though I lived not far away, but in those days it had something of a 'reputation' - a little unsavoury and not exactly safe (Ron Rubin remembers the point of his double bass disappearing through the floor boards.) It was probably nothing of the sort and there was certainly good music played there.
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https://www.sandybrownjazz.com.jazz-clubs-remembered/jazz-on-eel-pie-island