Excellent link, Bev.
The fifties Ravers had transferred themselves into most of the audience at the Ealing R&B club, when it opened in '61, with Alexis Korner every week. Sartorially and terpsichorally, at any rate. Well and politically, too.
The mention in one of the comments of the Ace Cafe on the N Circular I found a bit odd. By the time I moved to Ealing, mid '59, that was a bikers' cafe - and served the best All Day Breakfasts the world has ever known. More of a connection to the Rockers of a few years later than the Ravers. But maybe in '55 it was different.
Some places were ambiguous. The Crusader coffee bar towards South Ealing, where my mates and I hung, had a LOAD of Blue Beat singles on it, though I hardly ever saw any West Indians there. My fat friend Rose and I played them, anyway But we never fathomed why they were on the box.
MG