John Connolly had Alexis Korner's R and B at The Marquee and( he won't remember it was very esrly 60s)and I heard it at Beaconthorpe Youth Club in Cleethorpes.
Pye had just started their R'n'B Label (red and yellow) with Chuck Berry and load of Chess /Checker players, and a friend played me Muddy Waters at Newport and Terry and Mcghee's Blues is a Story LP. Before that I remember the name Leadbelly from the Donegan records and Wally Whyton had a lunchtime Light Programme series and I'm certain I heard the occasional Leadbelly song there.
What with Korner and Cyril Davies getting on the radio and Dave Berry and the Cruisers at the local dance hall the Blues was a wonderful discovery and still is.