For what it's worth........as I suspect everyone knows, Lonnie was banjo player in the original Ken Colyer band (along with Chris Barber and Monty Sunshine et al) and, apparently, Lonnie, Ken and Chris would use the intervals between the band's sessions at Ken's club in London to play and sing a few songs with Ken and Lonnie on guitars, and Chris on bass. I saw Ken do this 'interval act' at his club (c.1956?) after the whole band had left him (been sacked?) to become the Chris Barber band (with Pat Halcox on trumpet). Although Rock Island Line was indeed recorded at the Royal Festival Hall in 1954, Ken Colyer seems to me have been at least an equal partner with Lonnie in creating British skiffle. Skiffle's legacy? Not only the 60s folk boom, but much of the British rock 'n' roll scene.