Here's a really fantastic show, and a long one at that, from that flagship of radio cool. This is probably a good show if you know just a bit about Flamenco and want to learn more, and a really great show if you do know something about the music. All kinds of musical examples are played with plenty of pre-Paco de Lucia for you roots focused people. Brook talks about music theory, the song forms of Flamenco, murky origins of Flamenco, links to American Blues and Spanish music.
Also some interesting discussion of the origins of solo guitar in Flamenco, Sabicas and the like could not do the solo guitar thing in Spain, but in America it was accepted.