Art, also with respect, it's pretty clear from the dates quoted by the OP that it's the 2nd Sonny Boy he's talking about. Yes, we know his real name was Rice Miller, but he himself styled himself Sonny Boy williamson, and if you were searching for TV or film material featuring him in the UK in the 60s, you probably wouldn't turn up much using Rice Miller as the keywords!

I personally thought it was sheer cheek of RM to use Soony Boy's name - I also think the original SBW was a much better harp player! Shame about the ice pick... :-)