The Glyn Johns interview was initially from an early 80's BBC Radio documentary called Record Producers. There was 2 hour long specials on Johns' work. They're occasionally re-broadcast on BBC Radio 6 in their overnight documentary slot. The same interviews were later used in the 6 part BBC Radio 1 'Behind the Mask' series from 1986. A few people have asked me for a copy, which I will do when I get time. I'm reminded of George Harrison's comments about the Cream farewell tour from the Behind The Mask radio series. How George had gone to one of the shows and gone backstage and was confronted by Ginger Baker "growling" and crushing ice cubes between his teeth. George's response - "Christ, no wonder Eric wants to get out of this group!"